Fits 1994-1999 Toyota Celica GT.

Improve your engine's volumetric efficiency and throttle response with the Injen IS Series short ram air intake. This system replaces the restrictive factory intake tract with mandrel-bent T6-6061 aluminum piping, providing a smooth, high-velocity path for airflow. Designed as a direct bolt-on upgrade, the IS2040P is engineered to provide measurable power gains while maintaining safe air-to-fuel (A/F) ratios without requiring additional ECU tuning.

The kit features a dedicated heat shield to mitigate heat soak and includes Injen’s SuperNano-Web dry air filter. This advanced synthetic media increases surface area for maximum filtration and flow without the need for filter oil. Built for longevity, the intake produces a deep, aggressive engine note under load and is manufactured at Injen’s facility in Pomona, California.

• Manufacturer Part Number: IS2040P
• Construction: Mandrel-bent T6-6061 aluminum tubing
• Finish: Polished aluminum
• Filter Media: SuperNano-Web Dry Filter (Replacement: X-1012-BB)
• CARB EO #: D-476-3 (Emissions legal in select states)
• Heat Management: Integrated heat shield included
• Origin: Made in USA
• Warranty: Injen Technology Limited Lifetime Warranty

Fits 2000-2004 Toyota Celica GT and 2000-2003 Toyota Celica GTS.

Upgrade your vehicle's breathing with the Injen Technology IS Series Performance short ram air intake. This system replaces the restrictive factory airbox with a precision-engineered mandrel-bent T6-6061 aluminum intake tube, designed to provide a smooth, uninterrupted path for high-efficiency airflow. The result is a noticeable increase in horsepower and torque with an aggressive engine tone under wide-open throttle, all while maintaining safe air-fuel ratios without the need for additional tuning.

This kit features Injen’s SuperNano-Web dry air filter, which offers increased surface area for improved flow and superior filtration without the need for filter oil. Made in Pomona, California, this intake is fully CARB-compliant, making it street-legal in all 50 states.

• Manufacturer Part Number: IS2035P
• Tubing Material: Mandrel-bent T6-6061 Aluminum
• Finish: Polished Aluminum
• Filter Type: SuperNano-Web Dry Filter (X-1013)
• CARB EO #: D-476-8
• Replacement Filter: X-1010-BB
• Optional Hydroshield: 1035BLK / 1035RED
• Origin: Made in Pomona, California, USA
• Warranty: Limited Lifetime Warranty

Fits 1999-2000 Honda Civic EX and HX models (L4-1.6L).

The Injen IS Performance short ram air intake is engineered to provide immediate bolt-on power gains for your Honda Civic. By replacing the restrictive factory airbox with a precision mandrel-bent T6-6061 aluminum intake tube, this system reduces turbulence and optimizes airflow efficiency. The design is meticulously tested to ensure safe air-to-fuel (A/F) ratios are maintained across the entire powerband without the need for aftermarket ECU tuning.

This kit features the Injen SuperNano-Web dry air filter, which provides high-volume airflow and exceptional filtration surface area without the maintenance requirements of oiled filters. The black powder-coated finish offers a durable, professional look under the hood, while the intake geometry delivers a significantly more aggressive engine tone under load. Manufactured in Pomona, California, this system is CARB-exempt under EO #D-476-2, making it street-legal in all 50 states.

• Mandrel-bent T6-6061 aluminum intake tubing for maximum flow
• Includes SuperNano-Web dry air filter (MPN: X-1014-BB)
• Maintains safe A/F ratios with no additional tuning required
• Provides an aggressive engine tone under full throttle
• CARB EO #: D-476-2 (50-state legal)
• Compatible with optional Hydroshield (Part #1033BLK or 1033RED)
• Injen Technology Limited Lifetime Warranty
• Manufacturer Part Number: IS1555BLK

Fits 1991-1995 Acura Legend Base, GS, L, LS, and SE models (V6-3.2L).

The Injen IS Series Performance short ram air intake is engineered to improve airflow and throttle response for your Acura Legend. By replacing the restrictive factory air box with mandrel-bent T6-6061 aluminum tubing, this kit provides a smooth, uninterrupted path for intake air, resulting in a deeper, more aggressive engine tone under load. The system is designed to maintain safe air-fuel ratios throughout the powerband without requiring additional tuning. This kit includes the SuperNano-Web dry air filter, which provides high-flow filtration without the need for oiling. Proudly manufactured in Pomona, California, each intake is finished in a durable black powder coat and is street-legal in many jurisdictions under CARB EO # D-476-5.

• T6-6061 mandrel-bent aluminum intake tubing for maximum flow
• Durable black powder-coated finish
• Includes SuperNano-Web dry air filter (Replacement Part #X-1014-BB)
• CARB EO Number: D-476-5
• Optional Hydroshield compatible (Part #1033BLK or 1033RED)
• Manufacturer Part Number: IS1401BLK
• Made in the USA and backed by a Limited Lifetime Warranty

Fits 2017-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L Duramax Diesel (L5P), including 2019-2024 Medium Duty 4500-6500 (L5D) models.

Upgrade your 6.6L Duramax with the WCFab High Flow Cast Aluminum Turbo Intake Horn. This 4-inch inlet replaces the restrictive factory plastic mouthpiece to provide a 25% larger flow area at the compressor inlet and 27% better airflow overall compared to stock. Designed with a strategic anti-surge face that properly engages the turbo compressor cover, it optimizes airflow and drivability for both stock and OEM-style aftermarket drop-in turbochargers.

Constructed from CNC-machined cast aluminum for superior durability, this intake horn features an O-ring seal at the turbocharger face for a leak-free fit. It includes a #10 ORB threaded billet aluminum hose barb for a secure PCV system connection. This is a direct bolt-on upgrade that requires no tuning and is compatible with both factory and aftermarket cold air intake systems.

• Manufacturer Part Number: WCF100775-GW
• Replaces GM Part Numbers: 12678756, 19432816, 12682569
• Material: CNC Machined Cast Aluminum
• Finish: Gloss White Powder Coat
• Inlet Size: 4-inch
• Flow Increase: 27% better than stock
• Included Hardware: Mounting hardware and O-ring seal
• Origin: Made in USA

Fits 2017-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L Duramax L5P engine.

The WCFab 4 in. High Flow Cast Aluminum Turbo Intake Horn is a precision-engineered solution for the restrictive factory plastic turbo mouthpiece. Featuring a true 4-inch inlet and a smooth internal transition to an anti-surge face, this bolt-on upgrade increases the flow area at the compressor inlet by 25% and improves overall flow by 27% over stock. The CNC-machined cast aluminum construction ensures superior durability and provides a more aggressive engine and turbocharger sound without the need for aftermarket tuning.

• True 4" inlet with anti-surge face for optimized compressor engagement
• CNC machined cast aluminum construction with WCFab Grey powder coat finish
• Includes #10 ORB threaded billet aluminum hose barb for PCV system connection
• O-ring seal at the turbocharger face for a secure, leak-free fit
• Flows 27% better than the factory mouthpiece
• Compatible with stock and OEM-style drop-in turbochargers
• Replaces OE turbo inlet 12678756 (GM part numbers 19432816 and 12682569)
• Compatible with 2019-2024 L5D 6.6L Duramax in 4500/5500/6500 Medium Duty trucks
• Includes all necessary mounting hardware
• Manufacturer Part Number: WCF100775-GRY

Fits select 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks, plus 2019-2024 4500/5500/6500 Medium Duty models (6.6L Duramax L5P / L5D).

Eliminate the airflow bottleneck in your Duramax engine with the WCFab High Flow Cast Aluminum Turbo Intake Horn. This true 4-inch diameter inlet replaces the restrictive factory plastic mouthpiece, delivering a 25% increase in flow area at the compressor inlet and a 27% improvement in total airflow over the stock component. Engineered with a smooth-flowing transition and a strategically designed anti-surge face, this intake horn optimizes airflow and drivability while providing a more aggressive engine and turbo sound.

Constructed from CNC-machined cast aluminum for superior durability, this is a direct bolt-on upgrade that requires no aftermarket tuning. It features an O-ring seal at the turbocharger face for a leak-free fit and includes a #10 ORB threaded billet aluminum hose barb for a secure PCV system connection. This intake horn is compatible with both OEM and aftermarket cold air intake systems and works with stock or drop-in style performance turbochargers.

• True 4" CNC machined cast aluminum construction
• Flows 27% better than the factory mouthpiece
• Anti-surge face design for optimized compressor engagement
• Includes #10 ORB billet aluminum PCV hose barb and mounting hardware
• Durable gloss black powder coat finish
• No tuning or additional modifications required
• Replaces OE part number: 12678756 (GM Part Numbers 19432816, 12682569)
• Supersedes WCFab part numbers: WCF100721, WCF100833
• Manufacturer Part Number: WCF100775-GB
• Made in the USA

Fits select 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models equipped with the 6.6L L5P Duramax diesel engine.

The WCFab High Flow Intake Bundle Kit is a Stage 1 upgrade designed to resolve factory airflow restrictions and eliminate failure-prone plastic components. This kit replaces the factory 2.5-inch diameter hot side intercooler pipe and the two-piece plastic/rubber cold side assembly with heavy-duty, one-piece mandrel-bent aluminum piping. By increasing the hot side to 3 inches and the cold side to 3.5 inches, this bundle improves turbo spool-up, throttle response, and overall engine efficiency.

Constructed in the USA from 14-gauge aluminum, these pipes feature a durable Gloss White powder coat finish. The hot side pipe eliminates the OEM resonator for better flow, while the cold side pipe utilizes a CNC-machined flange with a double O-ring seal to prevent the boost leaks common with the factory clip-ring design. This system is a direct bolt-on replacement that requires no aftermarket tuning.

• Manufacturer Part Number: WCF100718-GW
• Hot Side Pipe: 3-inch diameter mandrel-bent 14-gauge aluminum
• Cold Side Pipe: 3.5-inch diameter mandrel-bent 14-gauge aluminum
• Connection: CNC machined flange with double O-ring seal
• Hardware: High-temp reinforced silicone boots and stainless steel T-bolt clamps
• Installation: Bolt-on design using basic hand tools; retains factory sensors
• Finish: Signature Gloss White powder coat

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD (6.6L L5P Duramax). This Wehrli Custom Fabrication (WCFab) 4" high-flow intake kit replaces the restrictive plastic factory components to improve engine efficiency and turbo response.

Built for the rigors of heavy-duty use, the kit features a large-diameter 4" fabricated aluminum intake pipe with smooth aerodynamic bends. The included air box and lid are constructed from durable 10-gauge aluminum sheet and feature a seal designed to connect directly to the functional hood ram air port, drawing in cooler, denser air from the hood duct and inner fender. This system provides a more aggressive turbo sound while maintaining a bolt-on installation that requires no aftermarket tuning.

• 4" large-diameter aluminum intake piping for improved air velocity
• Air box and lid constructed from 10G aluminum sheet
• Dry air filter assembly with Outerwear's pre-filter cover
• High-quality silicone boot and stainless steel T-bolt clamps included
• Gloss White powder coat finish for superior corrosion resistance
• No tuning required; compatible with stock vehicles
• Replaces GM part numbers: 84841229, 84841225, 84262962, 85614333, 84554702
• MPN: WCF100702-GW

Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L L5P Duramax diesel engine.

The WCFab 4-inch High Flow Intake Kit replaces the restrictive factory plastic components with a high-performance fabricated aluminum assembly designed to maximize airflow and thermal efficiency. By utilizing the functional hood ram air duct and inner fender air path, this system delivers cooler intake temperatures and increased air volume to the turbocharger, resulting in improved throttle response and more aggressive turbo sound during acceleration.

Constructed from heavy-duty 10-gauge aluminum sheet metal, the air box and lid provide a robust, heat-shielded environment for the included dry air filter. The 4-inch intake piping features smooth, aerodynamic bends to maintain high air velocity. This is a true bolt-on upgrade that requires no ECM tuning and is compatible with stock vehicle configurations.

• 4-inch fabricated aluminum intake pipe for maximum volume
• 10-gauge aluminum air box and lid with functional ram air seal
• High-flow dry air filter with Outerwear's pre-filter cover
• Durable gloss black powder coat finish
• Premium silicone boot and stainless steel T-bolt clamps
• Replaces OEM Part Numbers: 84841229, 84841225, 84262962, 85614333, 84554702
• Manufacturer Part Number: WCF100702-GB

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models (6.6L L5P Duramax).

The WCFab Stage 2 4-inch intake kit replaces the restrictive plastic factory intake components with high-flow fabricated aluminum parts. Designed specifically for the L5P Duramax, this kit features a 10-gauge aluminum sheet air box and lid that seals to the functional hood ram air port and inner fender to draw in cooler, denser air. The oversized 4-inch intake horn is more than one inch larger than the OEM diameter, eliminating the significant restriction found at the factory turbo inlet.

This bolt-on assembly improves intake air velocity and volume, resulting in quicker throttle response and more aggressive turbo sound without the need for an aftermarket tune. Each kit is finished in a durable custom red powder coat and includes a dry air filter with an Outerwears pre-filter cover for maximum protection and maintenance-free performance.

• Replaces GM Part Numbers: 84841229, 84841225, 84262962, 85614333, 84554702
• Fabricated 10G aluminum air box and lid
• Mandrel-bent 4-inch aluminum intake pipe
• High-flow 4-inch intake horn removes turbo inlet restriction
• Dry air filter with Outerwears pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• No tuning required; direct bolt-on installation
• Made in the USA
• Manufacturer Part Number: WCF100684-RED

Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

Eliminate the restrictions of the factory plastic induction system with the Wehrli Custom Fabrication (WCFab) Stage 2 4-inch Intake Kit. This system replaces the entire OEM air path with large-diameter, fabricated aluminum piping and a high-flow 10G aluminum air box. Designed to interface directly with the factory hood Ram Air duct and inner fender ports, this kit ensures the turbocharger receives a consistent supply of cool, dense air for improved throttle response and increased air velocity.

The centerpiece of the Stage 2 kit is the 4-inch intake horn, which is over an inch larger than the OEM diameter, removing the primary bottleneck found at the turbo inlet. Finished in a signature Gloss White powder coat, this kit provides a custom look under the hood while maintaining a simple bolt-on installation that requires no aftermarket tuning.

• 4-inch fabricated aluminum intake pipe and intake horn
• 10-gauge aluminum air box and lid with functional hood duct seal
• High-flow dry air filter assembly with Outerwears pre-filter cover
• Heavy-duty silicone boots and stainless steel T-bolt clamps
• Durable Gloss White powder-coated finish
• Direct bolt-on replacement for GM Part Numbers: 84841229, 84841225, 84262962, 85614333, 84554702
• No tuning required; compatible with stock trucks
• Manufacturer Part Number: WCF100684-GW
• Made in the USA

Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD (6.6L L5P Duramax).

The WCFab Stage 2 4in Intake Kit replaces the restrictive factory plastic intake components with a high-flow fabricated aluminum system designed to maximize turbo efficiency. This kit features a 4-inch diameter intake pipe and an oversized 4-inch intake horn that is over an inch larger than the OEM inlet, significantly reducing intake restriction. The included air box and lid are constructed from heavy-duty 10-gauge aluminum sheet and feature a custom seal that connects directly to the functional hood ram air port and inner fender duct for a steady supply of cool, dense air.

Built for durability and performance, this bolt-on system requires no tuning and utilizes high-quality silicone boots and stainless steel T-bolt clamps for secure connections. The assembly is finished in a durable Gloss Black powder coat. This kit replaces GM Part Numbers: 84841229, 84841225, 84262962, 85614333, and 84554702.

• Manufacturer Part Number: WCF100684-GB
• 4-inch diameter fabricated aluminum intake piping
• 4-inch oversized intake horn
• 10-gauge aluminum air box and lid
• High-flow dry air filter with Outerwears pre-filter cover
• Heavy-duty silicone boots and stainless steel T-bolt clamps
• Direct bolt-on installation; no tuning required
• Compatible with factory hood ram air port
• Made in the USA

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks (6.6L Duramax L5P).

The WCFab Stage 2 4-inch Intake Kit replaces the restrictive factory plastic induction system with a high-flow fabricated aluminum assembly. This kit features a 4-inch diameter intake pipe and an oversized intake horn that is over an inch larger than the OEM diameter, significantly reducing restriction at the turbo inlet. The included 10G aluminum air box and lid are designed to seal against the factory functional hood ram air port and inner fender, ensuring the engine draws in the coolest possible air for improved throttle response, increased horsepower, and lower intake temperatures.

• 4" fabricated aluminum intake pipe with smooth aerodynamic bends
• Oversized 4" intake horn to maximize air velocity at the turbo
• 10G aluminum sheet metal air box and lid
• High-flow dry air filter with Outerwears pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• Durable Candy Teal powder coat finish
• Direct bolt-on installation with no tuning required
• Replaces GM Part Numbers: 84841229, 84841225, 84262962, 85614333, 84554702
• MPN: WCF100684-CT
• Made in the USA

Fits select 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models equipped with the 6.6L L5P Duramax diesel engine.

The Wehrli Custom Fabrication (WCFab) Stage 2 High Flow Intake Bundle Kit is a comprehensive induction and charge-pipe overhaul designed to eliminate the significant bottlenecks found in the factory L5P air system. This kit replaces the restrictive OEM air box and intake horn with a high-flow 4-inch aluminum system and upgrades the entire charge path. By replacing the undersized 2.5-inch factory hot side pipe and the leak-prone plastic cold side pipe with heavy-duty aluminum units, this kit ensures maximum airflow and reliability under high boost pressures.

Constructed in the USA from mandrel-bent 14-gauge aluminum, the kit features a 3-inch hot side pipe and a 3.5-inch cold side pipe. WCFab has replaced the failure-prone OEM clip-ring design at the Y-bridge with a robust silicone boot and stainless steel T-bolt clamps. The air box features a removable lid for easy inspection of the dry filter and an included hydrophobic Outerwears pre-filter to protect the MAF sensor and turbo from contaminants.

• Manufacturer Part Number: WCF100441-RED
• 4 in. Mandrel-bent aluminum intake pipe and high-flow intake horn
• 3 in. Driver-side (Hot) intercooler pipe
• 3.5 in. Passenger-side (Cold) intercooler pipe
• Heavy-duty 14-gauge aluminum construction with Red powder coat finish
• Includes dry filter assembly and hydrophobic pre-filter cover
• CNC machined flange with double O-rings for a leak-free boost seal
• Heavy-duty silicone boots and stainless steel T-bolt clamps included
• Direct bolt-on installation; no ECU tuning required
• Retains factory sensors and mounting points

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

The Wehrli Custom Fabrication (WCFab) Stage 2 High Flow Intake Bundle Kit is a comprehensive induction and charge-air upgrade for the L5P Duramax. This kit addresses flow restrictions by replacing the factory 2.5-inch hot side and plastic 2-piece cold side intercooler pipes with heavy-duty, 1-piece aluminum tubing. By eliminating the OEM clip ring design at the Y-bridge in favor of a high-quality silicone boot and stainless steel T-bolt clamps, this system provides a superior seal capable of holding higher boost pressures without leaking.

The package includes a 4-inch diameter aluminum intake pipe and air box enclosure, providing a significant airflow increase over the factory diameter. A dry filter assembly with a hydrophobic Outerwears pre-filter cover is included to keep the MAF sensor and turbocharger free of contaminants. Made in the USA from 14-gauge aluminum with smooth mandrel bends, this kit is finished in a Gloss White powder coat and maintains all factory connection points and sensors for a straightforward bolt-on installation.

• 4 in. Mandrel-bent aluminum intake pipe and air box enclosure
• 4 in. Intake horn with PCV port and surge ring
• 3 in. Driver-side (Hot Side) intercooler pipe
• 3.5 in. Passenger-side (Cold Side) intercooler pipe
• Dry filter with hydrophobic Outerwears pre-filter cover
• CNC machined flange with double O-rings for leak-free sealing
• Heavy-duty 14-gauge aluminum construction
• Includes silicone boots, stainless steel T-bolt clamps, and all installation hardware
• Retains factory connection points and sensors; no tuning required
• Manufacturer Part Number: WCF100441-GW

Fits select 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models (6.6L L5P Duramax).

The Wehrli Custom Fab (WCFab) Stage 2 High Flow Intake Bundle Kit is a comprehensive performance upgrade designed to eliminate the most restrictive components of the L5P Duramax air track. This kit replaces the factory 2.5-inch resonator-equipped hot-side pipe and the failure-prone plastic/rubber cold-side pipe with heavy-duty 14-gauge mandrel-bent aluminum tubing. The result is a significant increase in durability and airflow efficiency for your heavy-duty truck.

The system features a 4-inch aluminum intake pipe paired with a custom air box enclosure and a high-flow dry filter protected by a hydrophobic Outerwears pre-filter. For maximum sealing reliability under high boost, WCFab replaces the OEM clip ring design at the Y-bridge with a high-quality silicone boot and stainless steel T-bolt clamps. The 3.5-inch cold side pipe utilizes a CNC-machined flange with a double O-ring seal to prevent boost leaks, ensuring your engine receives consistent, pressurized air even in demanding conditions.

• Air Intake: 4-inch aluminum intake pipe with intake horn and surge ring
• Hot Side Pipe: 1-piece 3-inch diameter 14 ga. aluminum construction
• Cold Side Pipe: 3.5-inch diameter 14 ga. aluminum construction
• Air Box: Enclosed design with removable lid for easy filter inspection
• Sealing: CNC machined flange with double O-rings and stainless steel T-bolt clamps
• Finish: Durable Gloss Black powder coat
• Installation: True bolt-on design; retains factory sensors and requires no tuning
• Included: Air intake, air box, dry filter, pre-filter cover, intercooler pipes, silicone boots, and hardware
• MPN: WCF100441-GB

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models equipped with the 6.6L L5P Duramax engine.

The Wehrli Custom Fab (WCFab) Stage 3 High Flow Bundle is a comprehensive solution to the airflow and reliability bottlenecks found in the factory L5P Duramax air track. This kit replaces the restrictive OEM resonator and prone-to-fail middle boot joints with heavy-duty components designed for high-boost environments and improved thermal efficiency. By upgrading both the intake and exhaust sides of the turbo system, this bundle eliminates horsepower-robbing boost leaks and reduces exhaust gas temperatures (EGTs).

The 4-inch aluminum intake pipe features a surge ring and connects to a dedicated air box enclosure with a high-flow dry filter and Outerwears pre-filter. On the charge side, the 3.5-inch cold side pipe utilizes a CNC-machined flange with a double O-ring seal to ensure a leak-free connection, while the 3-inch hot side pipe provides a direct path for compressed air. The package is completed with a 3.5-inch ceramic-coated and heat-wrapped downpipe that mates directly to the DOC outlet and factory exhaust system.

• 4 in. Aluminum intake pipe with air box enclosure and dry filter assembly
• 4 in. Intake horn with PCV port and surge ring
• 3.5 in. Cold side intercooler pipe (Passenger side) with CNC machined flange
• 3 in. Hot side intercooler pipe
• 3.5 in. Ceramic coated and heat-wrapped downpipe
• High-quality reinforced silicone boots and stainless steel T-bolt clamps
• Outerwears pre-filter cover included
• Retains factory connection points and all OEM sensors
• No tuning required; direct bolt-on installation
• Finished in WCFab signature Gloss White powder coat
• Made in the USA
• Manufacturer Part Number: WCF100418-GW

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models with the 6.6L L5P Duramax engine.

This Wehrli Custom Fabrication (WCFab) High Flow Intake Bundle Kit is a comprehensive air management upgrade designed to replace the restrictive factory intake and intercooler plumbing. By increasing the turbo inlet diameter to 4 inches and replacing the plastic/rubber OEM components with heavy-duty mandrel-bent aluminum, this kit optimizes airflow and significantly improves durability under high boost levels. The system is designed to bolt directly to factory mounting points and retains all OE sensors without the need for aftermarket tuning.

The package includes a Stage 2 intercooler pipe upgrade, replacing the 2.5-inch resonator-equipped driver-side (hot) pipe and the leak-prone 2-piece passenger-side (cold) pipe. The new 1-piece 3-inch hot-side and 3.5-inch cold-side pipes utilize CNC-machined flanges with double O-rings and high-quality silicone boots with stainless steel T-bolt clamps to eliminate boost leaks and ensure a secure connection even in high-performance applications.

• Manufacturer Part Number: WCF100414-RED
• 4 in. Mandrel-bent aluminum intake pipe and air box enclosure
• 3 in. Driver-side (Hot Side) intercooler pipe
• 3.5 in. Passenger-side (Cold Side) intercooler pipe
• Heavy-duty 14 ga. aluminum construction for maximum durability
• WCFab Dry Filter assembly with Outerwears hydrophobic pre-filter cover
• Eliminates OEM clip-ring design at Y-bridge for a superior silicone boot connection
• Retains factory connection points and MAF/PCV sensors
• Finished in a premium Illusion Cherry custom powder coat
• Made in the USA

The WCFab High Flow Intake Bundle Kit for the 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD (6.6L L5P Duramax) is a comprehensive airflow solution designed to eliminate the restrictions of factory intake and intercooler plumbing. This kit replaces the narrow OEM intake and the leak-prone plastic/rubber intercooler pipes with heavy-duty, oversized aluminum components for improved durability and optimized flow.

• Air Intake: Includes a 4 in. mandrel-bent aluminum intake pipe, air box enclosure, and dry filter assembly with a hydrophobic Outerwears pre-filter cover. The 4 in. intake horn features a PCV port and surge ring.
• Intercooler Piping: Upgrades the hot side to a 3 in. diameter 1-piece pipe and the cold side to a 3.5 in. diameter pipe. The 3 in. hot side pipe eliminates the restrictive OEM clip ring at the Y-bridge in favor of a silicone boot and T-bolt clamp for a leak-free seal under high boost.
• Construction: All pipes are fabricated in the USA from 14-gauge aluminum with smooth mandrel bends and finished in a Gloss White powder coat.
• Components: CNC machined flanges with double O-rings, high-quality silicone boots, stainless steel T-bolt clamps, and all necessary installation hardware.

This kit is a direct bolt-on upgrade that retains factory connection points and sensors. No aftermarket tuning is required for installation. Part Number: WCF100414-GW.

Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD (6.6L L5P Duramax).

The Wehrli Custom Fabrication (WCFab) Stage 2 High Flow Bundle Kit provides a complete overhaul of your L5P Duramax's induction and charge air system. This kit replaces the restrictive, multi-piece factory components with high-flow, 14-gauge mandrel-bent aluminum tubing. By upgrading the intake and intercooler piping, you eliminate common failure points such as the leak-prone plastic passenger-side cold pipe and the restrictive resonator-equipped driver-side hot pipe.

The included 4-inch intake features a high-flow turbo inlet horn and a sealed air box with a removable lid for easy inspection. For the intercooler side, WCFab upgrades the hot side to 3 inches and the cold side to 3.5 inches, utilizing CNC-machined flanges with double O-rings to ensure a leak-free seal under high boost pressures. Finished in a durable WCFab Grey powder coat, this kit is a complete bolt-on solution that requires no aftermarket tuning.

• 4 in. Aluminum intake pipe with sealed air box enclosure and dry filter
• Outerwears hydrophobic pre-filter cover included to protect the MAF sensor and turbo
• 4 in. Intake horn with PCV port and Surge Ring
• 3 in. Mandrel-bent hot side intercooler pipe (replaces 2.5 in. factory unit)
• 3.5 in. Mandrel-bent cold side intercooler pipe (replaces plastic/rubber factory unit)
• CNC machined flanges with double O-rings for superior sealing
• Heavy-duty 14-gauge aluminum construction with silicone boots and stainless steel T-bolt clamps
• Custom WCFab Grey powder coat finish
• No tuning required; retains factory connection points and sensors
• Manufacturer Part Number: WCF100414-GRY

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD models (6.6L L5P Duramax).

The Wehrli Custom Fab (WCFab) High Flow Intake Bundle Kit is a comprehensive induction solution designed to eliminate the flow restrictions of the factory L5P setup. This Stage 2 kit replaces the OEM intake and the leak-prone plastic/rubber intercooler pipes with heavy-duty 14-gauge mandrel-bent aluminum components. The 4-inch turbo inlet pipe is paired with an air box enclosure and a dry filter assembly, protected by a hydrophobic Outerwears pre-filter cover to keep your MAF sensor and turbocharger free of contaminants.

Beyond the intake, this bundle upgrades the restricted 2.5-inch driver-side (hot) pipe and the 2-piece passenger-side (cold) pipe with 3-inch and 3.5-inch diameter alternatives. By utilizing CNC-machined flanges with double O-rings and high-quality silicone boots with stainless steel T-bolt clamps, this kit provides a superior seal capable of holding higher boost pressures than the factory clip-ring design. This is a complete bolt-on upgrade that requires no aftermarket tuning.

• 4 in. Aluminum intake pipe with air box enclosure and dry filter assembly
• 3 in. Driver-side (Hot Side) intercooler pipe
• 3.5 in. Passenger-side (Cold Side) intercooler pipe
• Hydrophobic Outerwears pre-filter cover included
• Heavy-duty 14 ga. aluminum construction with smooth mandrel bends
• CNC-machined flange with double O-rings for a leak-free seal
• Replaces restrictive factory plastic and rubber piping
• Retains factory connection points and sensors
• No tuning required for installation
• Custom Gloss Black powder coat finish
• Made in the USA
• Manufacturer Part Number: WCF100414-GB

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD (L5P Duramax).

The WCFab High Flow Intake Bundle Kit is a comprehensive Stage 1 upgrade engineered to optimize airflow between the turbo and the engine. By replacing the restrictive factory intercooler pipes, this kit improves turbo spool-up, throttle response, and overall efficiency while eliminating common failure points that lead to power-robbing boost leaks. This bolt-on system is compatible with stock trucks and requires no aftermarket tuning.

This kit replaces the undersized 2.5-inch OEM driver-side (hot side) pipe and the failure-prone plastic/rubber passenger-side (cold side) pipe. WCFab utilizes heavy-duty 14-gauge mandrel-bent aluminum for maximum durability under high boost. The 3-inch hot side pipe eliminates the factory resonator and middle boot joint, reducing turbulence. The 3.5-inch cold side pipe features a CNC-machined flange with a double O-ring seal, replacing the weak factory clip-ring design for a superior seal at the Y-bridge.

• Driver Side (Hot Side) Pipe: 3 in. diameter 14 ga. aluminum; eliminates OEM resonator.
• Passenger Side (Cold Side) Pipe: 3.5 in. diameter 14 ga. aluminum; CNC-machined flange.
• Construction: Smooth mandrel bends with custom WCFab Red powder coat finish.
• Hardware: Includes heavy-duty reinforced silicone boots and stainless steel T-bolt clamps.
• Reliability: Replaces leak-prone plastic components with high-strength aluminum.
• Installation: Bolt-on fitment; retains all factory connection points and sensors.
• MPN: WCF100410-RED

Fits 2020-2025 Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD models equipped with the 6.6L L5P Duramax engine.

The WCFab High Flow Intake Bundle Kit is a comprehensive Stage 1 upgrade designed to eliminate the restrictive and failure-prone factory piping on the L5P Duramax. This kit replaces the 2.5-inch factory hot side pipe and the multi-piece plastic/rubber cold side pipe with heavy-duty aluminum components to optimize airflow between the turbo and the engine. By removing the OEM resonator and secondary boot joints, this bundle improves efficiency, throttle response, and turbo spool-up.

Engineered for high-performance and heavy-duty applications, these pipes are manufactured in the USA from 14-gauge mandrel-bent aluminum. The 3.5-inch passenger side pipe features a CNC-machined flange with a double O-ring seal, replacing the weak OEM clip ring design at the Y-bridge with a robust silicone boot and stainless steel T-bolt clamp connection to handle increased boost pressures without leaking.

• 3 in. Driver Side (Hot) Intercooler Pipe: 1-piece mandrel-bent design eliminates the factory resonator and middle boot joint.
• 3.5 in. Passenger Side (Cold) Intercooler Pipe: Oversized diameter for maximum airflow efficiency.
• Construction: High-strength 14-gauge aluminum tubing finished in Gloss Black powder coat.
• Reliable Sealing: Includes high-quality reinforced silicone boots, stainless steel T-bolt clamps, O-rings, and intercooler outlet clip.
• Installation: Retains factory connection points and sensors; compatible with stock trucks with no tuning required.
• Manufacturer Part Number: WCF100410-GB

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models equipped with the 6.6L L5P Duramax diesel engine.

The WCFab 4" Intake Kit is engineered to replace the restrictive plastic factory intake plumbing and air box with a high-flow, fabricated aluminum system. This kit features a 4" diameter intake pipe with smooth aerodynamic bends to increase air velocity and volume. By drawing cold air from both the hood's functional ram air duct and the inner fender, this system reduces intake temperatures and improves throttle response while providing a more pronounced turbo and engine sound.

Constructed from durable aluminum, the air box enclosure includes a removable lid for easy maintenance of the high-flow dry filter. For added protection, the kit includes an Outerwear's hydrophobic pre-filter cover to keep moisture and large debris away from the MAF sensor and turbo compressor. This system is a true bolt-on upgrade that requires no engine tuning and maintains a clean engine bay aesthetic by relocating the ram air duct seal to the bottom of the hood.

• Manufacturer Part Number: WCF100344-GW
• 4" fabricated aluminum intake pipe for maximum flow
• Aluminum air box enclosure with removable lid
• High-flow dry air filter with Outerwear's hydrophobic pre-filter cover
• Includes high-quality silicone boot and stainless steel T-bolt clamps
• Finished in a durable Gloss White single-stage powder coat
• Direct bolt-on installation; no tuning required

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

The Wehrli Custom Fabrication (WCFab) 4-inch Intake Kit replaces the restrictive plastic factory components on your diesel with high-flow, fabricated aluminum parts. This kit significantly increases air volume to the turbocharger, improving throttle response and maintaining cooler intake temperatures by drawing air from both the functional hood ram air duct and the inner fender. The large 4-inch piping features smooth aerodynamic bends to maximize air velocity while providing a more aggressive engine and turbo sound during acceleration.

This kit is a true bolt-on solution that requires no additional tuning or modifications. It includes a removable air box lid for easy maintenance and an Outerwear’s hydrophobic pre-filter to protect your MAF sensor and engine airways from contaminants. The entire assembly is finished in a durable Gloss Black powder coat (MPN: WCF100344-GB) for a professional look under the hood.

• 4-inch diameter aluminum intake pipe
• Fabricated aluminum air box enclosure with lid
• High-flow dry air filter
• Hydrophobic Outerwear's pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• Custom seal for connection to functional hood ram air port
• Direct bolt-on installation with no tuning required

Fits select 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD models (6.6L Duramax LML).

The Wehrli Custom Fabrication (WCFab) 4" Intake Kit replaces the restrictive factory plastic intake components with high-flow, fabricated aluminum for improved engine performance. This system features large-diameter 4" piping with smooth aerodynamic bends to increase air velocity and volume, drawing cooler air through the inner fender for reduced intake temperatures and quicker throttle response. The enclosed air box includes a removable lid for easy maintenance and provides a more aggressive turbo sound under acceleration.

Built for durability and ease of installation, the kit includes a high-flow dry air filter and an Outerwear’s hydrophobic pre-filter cover to keep your MAF sensor and turbo clear of contaminants. The entire assembly is finished in a Gloss Black powder coat and is a direct bolt-on upgrade that requires no aftermarket tuning.

• Manufacturer Part Number: WCF100194-GB
• Construction: 4" fabricated aluminum piping
• Filter: High-flow dry filter with hydrophobic pre-filter cover
• Hardware: Silicone boot and stainless steel T-bolt clamps included
• Finish: Gloss Black custom powder coat
• Origin: Made in USA

Fits 2006-2007 Chevrolet Silverado and GMC Sierra 2500 HD/3500 models equipped with the 6.6L LBZ Duramax diesel engine.

The factory Y-bridge on the LBZ Duramax is a notorious failure point; its two-piece slip-fit design is prone to blowing apart under high boost levels, leading to significant power loss and poor drivability. The Wehrli Custom Fab (WCFab) High Flow 3" Y-Bridge Kit solves this with a robust, bolt-together two-piece bridge that provides a secure, leak-free sealing surface. This kit streamlines the intake tract with a full 3-inch diameter from the intercooler pipe connection to the engine, resulting in a 36% improvement in airflow over the stock configuration.

Constructed with mandrel-bent tubing and CNC-machined billet flanges, this kit maintains compatibility with the factory grid heater and EGR connection controls. It is a direct bolt-on upgrade that requires no additional tuning or vehicle modifications, making it an ideal solution for both stock trucks and high-performance builds using emissions-compliant tuning.

• WCFab Signature 3" Two-Piece Y-Bridge (Gloss Black finish)
• 3" Mandrel-bent upper intercooler crossover pipe
• 3" Lower intercooler pipe
• 36% increase in airflow over OEM intake
• Compatible with OEM lower passenger side intercooler pipe
• Includes high-temp silicone boot and stainless steel T-bolt clamps
• Includes MAP sensor seal, O-ring seals, and EGR/grid heater hardware
• Made in the USA
• Manufacturer Part Number: WCF100163-GB

The Weapon R Dragon Ram Air Kit II (838-111-110) is an essential performance accessory designed to optimize your intake system's efficiency. This kit works by ducting high-velocity, ambient air from outside the engine compartment directly to the air filter, significantly reducing intake temperatures and mitigating heat soak.

Constructed with a durable, flexible hose, the kit allows for custom routing through the engine bay to tap into high-pressure air sources. This specific version features a black finish, providing a stealthy look while improving the throttle response and induction efficiency of your Dragon intake system.

• Brand: Weapon R
• Product Line: Dragon Ram Air Kit II
• Manufacturer Part Number: 838-111-110
• Finish: Black
• Function: Sources cool, high-velocity air for the intake filter
• Installation: Flexible ducting for versatile routing and placement

The Weapon R Ram Air Kit II is engineered to optimize intake efficiency by delivering a constant stream of cool, high-pressure air directly to your engine's air filter. By sourcing air from outside the engine bay, this kit helps bypass the stagnant, heat-soaked air that often limits performance in standard configurations.

The kit features high-temperature flexible ducting that allows for precise routing from the front of the vehicle to the intake inlet. This design helps maintain a denser oxygen charge, supporting better combustion and improved throttle response. It is a practical solution for drivers looking to maximize the effectiveness of their existing intake system through better thermal management.

• Directs cool, pressurized external air to the intake system
• Reduces intake air temperatures to combat engine bay heat soak
• Includes durable, high-temperature flexible ducting and mounting hardware
• Designed for custom routing and easy installation
• Manufacturer Part Number: 838-111-108