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

The Wehrli Stage 1 High Flow Bundle Kit is engineered to optimize the induction system of your L5P Duramax by replacing restrictive factory components with high-flow alternatives. This kit improves turbocharger efficiency and throttle response by streamlining the air path. Finished in a durable gloss black powder coat, these components are built to withstand the extreme heat and vibration of heavy-duty diesel applications while providing a clean, professional appearance under the hood.

• Improves airflow and induction efficiency on L5P Duramax engines
• Premium gloss black powder-coated finish for corrosion resistance
• Heavy-duty construction replaces prone-to-failure factory parts
• Designed for precise fitment on 2017-2019 GM 2500/3500 HD trucks

• Manufacturer Part Number: WCF100718-GB
• Series: Stage 1 High Flow
• Finish: Gloss Black
• Engine Compatibility: 6.6L L5P Duramax

Fits select 1994-2024 Dodge/Ram 2500, 3500 and Ford F-250, F-350 Super Duty trucks with RCLB, CCSB, or ECSB configurations.

The Wehrli Custom Fabrication 60-inch Traction Bar Kit is engineered to eliminate axle wrap and wheel hop, common issues in high-torque diesel and heavy-duty towing applications. By stabilizing the rear axle housing and preventing it from rotating under load, these bars ensure more consistent power delivery to the ground while protecting your U-joints, driveshaft, and leaf springs from excessive stress.

Constructed for durability and precision, this kit features a sleek Gloss Black powder-coated finish for superior corrosion resistance and a clean aesthetic. Whether you are launching at the track or hauling heavy loads, these bars provide the structural rigidity needed to maintain proper pinion angles and suspension geometry.

• Length: 60 inches
• Finish: Gloss Black Powder Coat
• Application: RCLB (Regular Cab Long Bed), CCSB (Crew Cab Short Bed), ECSB (Extended Cab Short Bed)
• Prevents axle wrap and improves traction
• Protects critical driveline components
• Includes necessary mounting hardware

Fits select 1995-2024 Ford F-250/F-350 Super Duty and Dodge/Ram 2500/3500 Extended Cab Long Bed (ECLB) and Crew Cab Long Bed (CCLB) models.

The Wehrli 68in Traction Bar Kit is engineered to eliminate axle wrap and wheel hop, common issues in high-torque diesel applications and heavy towing scenarios. By stabilizing the rear axle housing, these bars ensure power is efficiently transferred to the ground while protecting your u-joints, driveshaft, and leaf springs from the excessive stress of axle rotation. Designed specifically for long-wheelbase configurations, this kit provides the structural rigidity needed for modified street trucks or heavy-duty work vehicles.

• Prevents rear axle rotation (axle wrap) during hard acceleration and towing
• Reduces wheel hop to improve traction and driveline longevity
• Durable 68-inch heavy-wall tubing construction for maximum rigidity
• Premium Gloss Black powder coat finish for superior corrosion and chip resistance
• Includes vehicle-specific mounting brackets and high-strength installation hardware
• Engineered for Extended Cab Long Bed and Crew Cab Long Bed wheelbases

Fits 2011-2019 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks with Regular Cab Long Bed (RCLB), Crew Cab Short Bed (CCSB), or Extended Cab Short Bed (ECSB) configurations.

Eliminate axle wrap and rear-end wheel hop with the Wehrli 60-inch Traction Bar Kit. Engineered for high-torque heavy-duty trucks, these bars prevent the rear leaf springs from twisting under heavy acceleration or towing loads. By stabilizing the rear axle, this kit ensures power is efficiently transferred to the ground while protecting critical drivetrain components like U-joints and driveshafts from excessive stress. Each bar features a high-quality Gloss Black powder coat finish for superior corrosion resistance and a professional look under your truck.

• Bar Length: 60 inches
• Finish: Gloss Black Powder Coat
• Configurations: RCLB, CCSB, and ECSB (Regular Cab Long Bed, Crew Cab Short Bed, Extended Cab Short Bed)
• Compatibility: 2011-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models with Double Cab Long Bed (DCLB) or Crew Cab Long Bed (CCLB) configurations.

Eliminate axle wrap and prevent wheel hop in high-torque diesel applications with the Wehrli Custom Fab 68-inch Traction Bar Kit. Designed specifically for long-wheelbase heavy-duty trucks, these bars stabilize the rear axle housing to prevent leaf spring twisting during hard acceleration or heavy towing. This ensures consistent traction and protects your driveline components from the stress of uncontrolled axle rotation.

• Length: 68 inches, optimized for DCLB and CCLB chassis
• Finish: Heavy-duty Gloss Black powder coat for corrosion resistance
• Application: Reduces axle wrap and wheel hop under load
• Compatibility: Engineered for 2020-2025 GM 2500/3500 HD platforms
• Kit includes: Left and right traction bars with all necessary mounting hardware

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models in Regular Cab Long Bed (RCLB), Crew Cab Short Bed (CCSB), and Extended Cab Short Bed (ECSB) configurations.

High-torque diesel applications like the L5P Duramax often suffer from axle wrap, where the rear axle housing rotates during hard acceleration or heavy towing. This rotation leads to wheel hop, reduced traction, and increased wear on universal joints and drivetrain components. The Wehrli 60-inch Traction Bar Kit provides the necessary leverage to stabilize the rear axle, ensuring your tires stay planted and power is delivered efficiently to the ground.

Each kit features a durable Gloss Black powder coat finish for superior corrosion resistance and a clean look beneath the chassis. These 60-inch bars are engineered for the specific frame geometry and wheelbases of the 2020+ GM heavy-duty platform, offering a bolt-on solution to improve vehicle control and drivetrain longevity.

• Length: 60 inches
• Finish: Gloss Black Powder Coat
• Application: Rear axle stabilization and wheel hop prevention
• Configuration Compatibility: RCLB, CCSB, and ECSB wheelbases
• Fits: 2020-2025 Silverado/Sierra 2500 HD and 3500 HD

Fits 2011-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD Extended Cab Long Bed (ECLB) and Crew Cab Long Bed (CCLB) models.

Engineered to handle the high torque output of the Duramax diesel platform, this Wehrli 68-inch traction bar kit is essential for eliminating wheel hop and preventing axle wrap. By stabilizing the rear axle housing during heavy acceleration or towing, these bars ensure power is efficiently transferred to the pavement while protecting critical drivetrain components like leaf springs and u-joints from premature wear and failure.

Specifically designed for long-wheelbase configurations, this kit features a durable Gloss Black powder-coated finish for superior corrosion resistance and a clean aesthetic. Whether you are hauling heavy loads or looking for better traction at the track, these bars provide the geometry needed for consistent axle control.

• Length: 68 inches
• Finish: Gloss Black Powder Coat
• Chassis Compatibility: Extended Cab Long Bed (ECLB) and Crew Cab Long Bed (CCLB)
• Primary Function: Eliminates axle wrap and wheel hop

Fits select 2011-2016 Chevrolet Silverado 2500 HD and 3500 HD trucks.

These WCF Intercooler Pipes are designed to replace the restrictive factory piping in your vehicle's charge air system. By upgrading to these high-flow pipes, you ensure more consistent airflow from the turbocharger to the intercooler and into the intake, reducing potential failure points found in OEM plastic or rubber components. These pipes are built to handle higher boost pressures and provide a more durable solution for heavy-duty towing and performance applications.

• Direct-fit replacement for factory intercooler piping
• Engineered for improved airflow efficiency
• Fits both 2500 HD and 3500 HD chassis
• Designed specifically for the 2011-2016 Silverado HD platform

Fits select 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L). This Wehrli Custom Fabrication (WCFab) Stage 2 Intake Kit is a high-flow induction solution designed to replace the restrictive factory plastic components on the L5P Duramax. By utilizing a 4-inch diameter mandrel-bent aluminum intake pipe and a massive 3.5-inch intake horn, this system significantly increases air volume and velocity to the turbocharger.

The kit features a custom-fabricated aluminum air box that utilizes a functional connection to the factory hood ram air port and inner fender duct for a steady supply of cool, dense air. The assembly is finished in a durable Gloss White powder coat and includes a high-efficiency dry air filter with a hydrophobic Outerwear pre-filter cover to protect the MAF sensor and turbo from contaminants. This is a true bolt-on upgrade that requires no aftermarket tuning for operation.

• 4-inch mandrel-bent aluminum intake pipe
• 3.5-inch high-flow intake horn
• Fabricated aluminum air box with removable lid
• Direct-fit seal for functional hood ram air port
• Dry air filter with Outerwear's pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• Custom Gloss White powder coat finish
• Manufacturer Part Number: WCF100645

Fits select 2001-2024 GM Duramax and RAM 6.7L Cummins (2004.5-2007 & 2010-2024) equipped with WCFab fabricated coolant tanks.

The Wehrli Custom Fabrication (WCFab) Billet Coolant Tank Cap is a premium replacement designed for high-performance cooling systems. Precision-machined from billet aluminum and finished with a durable black anodized coating, this cap is engineered to match existing WCFab oil and brake reservoir caps for a cohesive look across your engine bay. Rated at 18-20 PSI, it ensures reliable pressure regulation for your fabricated coolant reservoir.

• Pressure Rating: 18-20 PSI
• Construction: CNC-machined billet aluminum
• Finish: Corrosion-resistant black anodized
• Compatibility: Exclusively for WCFab fabricated coolant tanks
• Matches WCFab billet oil and brake reservoir caps

Fits 2006-2024 Dodge and Ram 2500/3500 trucks equipped with the 5.9L or 6.7L Cummins diesel engine.

Enhance your engine bay with the Wehrli Custom Fabrication (WCFab) brake reservoir cover. This component is engineered to fit directly over the unsightly factory plastic reservoir, providing a clean, custom look without requiring the removal of the master cylinder. Fabricated from high-grade aluminum and TIG welded for durability, this cover is finished in a signature WCFab Red single-stage powder coating for a long-lasting, vibrant appearance.

• Fabricated aluminum construction with precision TIG welding
• Custom single-stage WCFab Red powder coat finish
• Utilizes OEM mounting points and factory hardware for a secure fit
• Installs in minutes with basic hand tools
• Manufacturer Part Number: WCF100209-RED

Note: On some 2007.5-2009 models, a large electrical connector bulkhead located next to the master cylinder must be unbolted and relocated or supported by the firewall harness to clear the new cover.

Fits select 2006-2010 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks (6.6L LBZ/LMM Duramax).

Maximize your engine's breathing capacity with the Wehrli Custom Fabrication (WCFab) 3.5-inch intake horn. This cast aluminum component features a massive 4.8-inch inlet—the largest available on the market—specifically engineered to eliminate the restrictive factory resonator connection and streamline airflow to the turbocharger. Finished in a high-quality gloss black single-stage powder coating, this upgrade provides both performance gains and a clean, custom engine bay aesthetic.

Note on Compatibility: This intake horn is compatible only with intake systems that utilize a removable boot and two clamps for the horn-to-pipe connection. It will not fit OEM or aftermarket systems where the boot is molded directly to the intake pipe.

• High-flow cast aluminum construction
• Large 4.8-inch inlet diameter for maximum air volume
• Eliminates restrictive factory resonator connection
• Durable gloss black single-stage powder coat finish
• Includes PCV port and O-ring seal for a factory-quality fit
• Supplied with silicone reducer boot and stainless steel T-bolt clamps
• Made in the USA
• Manufacturer Part Number: WCF100412-GB

This Wehrli Custom Fabrication (WCFab) thin-flange coolant fitting is engineered specifically for the coolant port located behind the water pump on 6.7L Cummins engines. Precision CNC machined from billet aluminum, it provides a robust connection compared to standard fittings. The design utilizes a press-fit connection secured by a high-temperature O-ring seal and an integrated mounting bolt tab to ensure a leak-free seat even under high thermal stress.

• Fits 6.7L Cummins engines
• #10 JIC Male fitting for simplified plumbing
• CNC machined from high-grade billet aluminum
• Durable black anodized finish for corrosion resistance
• High-temperature O-ring seal included
• Integrated mounting bolt tab for secure installation
• Made in the USA
• Manufacturer Part Number: WCF205-136

Fits 2013-2018 Ram 2500 and 3500 trucks equipped with the 6.7L Cummins diesel engine.

Clean up your engine bay by replacing the fragile, unappealing OEM plastic shroud with this WCFab Fabricated Aluminum Radiator Cover. Designed to span the radiator and core support, this cover provides a custom, finished look that stands up to the heat and vibration of heavy-duty use. Each cover is CAD-designed and precision laser-cut from heavy-duty 10-gauge aluminum sheet, then CNC-bent for an exact fit over factory mounting points.

This kit includes a riveted-on aluminum WCFab logo and a high-quality Gloss White powder coat finish for long-term durability. It comes complete with all necessary installation hardware, including slip-nuts and 6mm stainless steel button head cap screws. This unit is also compatible with 2013-2015 dual radiator configurations.

• Material: 10G Aluminum Sheet
• Finish: Gloss White Powder Coat
• Hardware: Stainless steel button head cap screws and slip-nuts included
• Installation: Replaces factory plastic shroud; fits with OEM grille
• Compatibility: Fits 2013-2015 dual radiator trucks
• Origin: Made in USA
• Manufacturer Part Number: WCF100546-GW

Note: Specifically designed for use with the OEM grille. Some aftermarket grilles may require trimming or may cause fitment interference.

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

Replace the factory rubber upper radiator hose on your L5P Duramax with a high-performance Wehrli Custom Fabrication (WCFab) hard pipe. This fabricated aluminum pipe eliminates the potential for hose expansion or failure under pressure while significantly cleaning up the appearance of your engine bay. Designed as a direct bolt-on for trucks equipped with the OEM GM radiator, this kit installs easily with basic hand tools and requires no permanent vehicle modifications.

• Fabricated aluminum coolant pipe construction
• Durable WCFab Red powder coat finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Direct replacement for GM Part Numbers: 84813629, 85122989
• Compatible with factory radiator and mounting points
• Manufacturer Part Number: WCF100541-RED

Fits select 2013-2018 Ram 2500 and 3500 HD trucks (6.7L Cummins). This Wehrli Custom Fabrication (WCFab) Upper Coolant Pipe replaces the factory rubber radiator inlet hose with a more durable, aesthetic aluminum hard pipe. Note: This part is for use with the OEM RAM radiator and is not compatible with 2013-2015 models equipped with dual radiators or twin CP3 pumps.

Constructed from high-quality aluminum, this pipe eliminates the risk of hose expansion or failure under pressure. Each kit is finished in a durable WCFab Red powder coat and includes heavy-duty silicone boots and stainless steel T-bolt clamps for a secure, leak-free installation on factory mounting points.

• Replaces failure-prone OEM rubber upper coolant hose
• Direct fit for trucks with factory radiator dimensions
• Durable WCFab Red custom powder coat finish
• Includes heavy-duty silicone boots and T-bolt clamps
• MPN: WCF100517-RED
• Replaces MOPAR Part Numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, 68227796AA

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

Upgrade your engine bay and eliminate the unreliable factory plastic reservoir with the WCFab Fabricated Aluminum Coolant Tank Kit. Engineered to bolt directly into the OEM coolant tank location, this kit replaces the original clear plastic reservoir with a durable, custom powder-coated aluminum unit. It features an integrated sight glass, allowing for quick and accurate fluid level checks without needing to open the system.

This kit is a complete bolt-on solution for stock or modified trucks, requiring no additional modifications. It includes a premium CNC machined billet aluminum cap with a black anodized finish, a new low coolant level sensor, and all necessary mounting hardware for a clean, professional installation using factory mounting points.

• Fabricated aluminum construction for superior heat resistance and durability
• Integrated coolant level sight glass for easy monitoring
• Includes black anodized CNC machined billet aluminum cap
• Custom WCFab Red powder coat finish
• Complete with low coolant level sensor, overflow hose, and mounting hardware
• Replaces GM Part Numbers: 23394082, 84622147
• Supersedes WCF100679
• Manufacturer Part Number: WCF100268-RED

Fits 2001-2004 Chevrolet Silverado and GMC Sierra 2500 HD/3500 (LB7 Duramax) equipped with S300 or S400 single turbocharger configurations.

The factory LB7 Duramax Y-bridge is a notorious bottleneck that limits intake efficiency and power potential in high-performance builds. The Wehrli Custom Fab (WCFab) 3-inch High Flow Y-Bridge eliminates this restriction by providing a larger, more direct air path to the intake runners. Specifically designed for custom fabrication and aftermarket turbo setups, this bridge bolts to the factory intake runners and features a 3-inch bead-rolled connection at the inlet for secure plumbing.

Construction features a 14-gauge aluminum neck TIG-welded to a CNC-machined billet aluminum center section and flanges for maximum strength under boost. This kit includes critical components for a professional installation, including an FPRV block-off kit to provide the necessary clearance from the bridge to the fuel distribution block.

• Material: 14-gauge aluminum neck with CNC-machined billet aluminum flanges
• Construction: Hand-built TIG-welded design
• Ports: Integrated MAP sensor bung and 1/8" NPT accessory port (for boost gauge or sensor)
• Clearance Requirements: Requires minimum T4 pedestal height of 5" for S300 turbos or 6" for S400 turbos
• Finish: Raw aluminum (requires painting, polishing, or powder coating before use to prevent oxidation)
• Includes: 3" silicone boot, stainless steel T-bolt clamps, MAP sensor bracket and seal, new O-ring flange seals, and FPRV block-off kit
• Origin: Made in USA
• MPN: WCF100615-RAW

Note: This is not a direct OEM replacement and is intended for custom turbocharger installations.

Designed for custom racing applications, the Wehrli Custom Fabrication (WCFab) WCF100325 T4 Turbo Pedestal allows for the installation of T4 flange-style turbochargers on L5P Duramax engines. This heavy-duty fabricated component is engineered to provide a stable mounting platform for performance turbo setups while maintaining compatibility with both factory and WCFab high-flow up pipes.

Built for durability and heat management, the pedestal is constructed from 11-gauge 2-inch OD stainless steel tubing. The assembly is finished in a Black High Temp Ceramic Coating to withstand extreme exhaust temperatures and prevent corrosion in demanding racing environments. This pedestal is a critical upgrade for builds moving away from the restrictive factory VGT turbocharger to a fixed-geometry T4 alternative.

• Fits L5P Duramax engine platforms
• Allows mounting of T4 flange turbochargers for custom builds
• Fabricated from 11-gauge stainless steel 2-inch OD tubing
• Durable Black High Temp Ceramic Coated finish
• Compatible with OEM or WCFAB 2-inch High Flow Turbo Up Pipes
• Includes all necessary pedestal mounting hardware
• Manufacturer Part Number: WCF100325

Fits 2015-2019 Chevrolet Silverado 2500 HD and 3500 HD (6.6L).

Protect your drivetrain components without compromising performance. The WCFab bumper grille is engineered specifically for the 2015-2019 Silverado HD, providing a robust barrier against road debris that can damage your transmission cooler. Unlike solid plates, this heavy-duty insert features a precision-cut design that maintains critical airflow to the cooling stack, ensuring your Duramax continues to operate at stable temperatures even under load.

Constructed from heavy gauge stainless steel for superior durability, this grille is finished in a high-gloss black powder coat to provide a clean, integrated look for your truck's front end. Installation is straightforward and can be completed using basic hand tools, making it an essential upgrade for both protection and aesthetics.

• Fits 2015-2019 Chevrolet Silverado 2500/3500 HD
• Heavy gauge stainless steel construction
• High-gloss black finish
• Maintains maximum airflow to the transmission cooler
• Protects against rocks and flying road debris
• Simple installation with basic hand tools
• Manufacturer Part Number: WCF100290-GB

Fits select 1999-2023 GM vehicles including Chevrolet Silverado and GMC Sierra 1500, 2500 HD, 3500 HD, Suburban, Tahoe, Yukon, Cadillac Escalade, and Hummer H2.

The factory plastic heater core firewall fitting is a notorious failure point on GM trucks and SUVs, often becoming brittle and cracking due to constant heat cycles and engine vibration. This Wehrli Custom Fabrication (WCF) billet aluminum fitting provides a permanent, professional-grade solution. This direct-fit upgrade replaces the fragile OEM plastic component with a precision-machined part designed to handle high cooling system pressures without the risk of sudden failure.

Each fitting is CNC-machined from high-grade aluminum and features a 5/8" hose barb and a double O-ring seal to ensure a positive, leak-free connection at the firewall. The clear anodized finish adds an extra layer of protection against corrosion, making it an essential cooling system upgrade for both Duramax diesel and gasoline GM engines.

• Manufacturer Part Number: WCF100155
• Replaces GM/AC Delco Part Number: 15032062
• Material: CNC-machined billet aluminum
• Finish: Clear anodized for superior corrosion resistance
• Connection: 5/8" hose barb
• Sealing: Double O-ring design for maximum leak protection
• Installation: Easy direct-fit replacement for the factory plastic fitting
• Origin: Made in the USA

This Wehrli Custom Fabrication coolant plug is designed to securely block off the 1.1-inch bore on Duramax engine covers. Precision CNC-machined from high-grade billet aluminum, this component offers a significant upgrade in durability and aesthetics compared to generic alternatives.

The plug features a sleek black anodized finish, providing excellent resistance to corrosion and wear in high-heat engine bay environments. For a reliable, leak-free installation, the assembly includes a high-temperature silicone O-ring specifically chosen to withstand the thermal cycles of a heavy-duty diesel engine.

• Material: CNC-machined billet aluminum
• Finish: Black anodized for corrosion resistance
• Bore Compatibility: 1.1"
• Hardware: Includes high-temperature silicone O-ring seal
• Application: Duramax Engine Cover
• Manufacturer Part Number: WCF100025

Fits select 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks (6.6L Duramax Diesel). Also compatible with 2019-2024 L5D 6.6L Duramax found in Medium Duty 4500, 5500, and 6500 GM trucks.

The WCFab 4 in. High Flow Cast Aluminum Turbo Intake Horn is engineered to eliminate the restriction of the factory plastic turbo mouthpiece. By utilizing a true 4-inch inlet and a CNC-machined anti-surge face that properly engages the turbo compressor cover, this upgrade provides a 25% greater flow area at the compressor inlet and flows 27% better than the stock component. This bolt-on part improves throttle response and engine performance without requiring additional tuning or modifications.

• CNC machined cast aluminum construction with a WCFab Red powder coat finish
• 27% increased airflow over the OEM turbo inlet
• True 4" inlet with smooth internal transitions for optimized drivability
• Includes #10 ORB threaded billet aluminum hose barb for PCV system connection
• Precision O-ring seal at the face of the turbocharger for a leak-free fit
• Compatible with stock and OEM-style aftermarket drop-in turbochargers
• Works with factory and most aftermarket cold air intake systems
• Replaces OEM turbo inlet 12678756 (GM Part Numbers: 19432816, 12682569)
• Includes all necessary mounting hardware; Made in USA

Fits select 2001-2004 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 models (6.6L LB7 Duramax).

The WCFab High Flow 3-inch Complete Y-Bridge Kit is engineered to resolve the primary airflow restrictions in the LB7 intake tract. This kit replaces the narrow factory Y-bridge and restrictive cold-side intercooler pipe with a full 3-inch system, increasing airflow by up to 50% over the OEM components. By streamlining the path from the intercooler outlet to the engine, this kit significantly improves throttle response and turbo spool-up.

Designed for versatility, this fabricated billet Y-bridge is compatible with the factory IHI turbocharger as well as aftermarket drop-in IHI-style chargers. The kit also eliminates the angled OEM intercooler boots, which are known failure points under increased boost. Every component is finished in a durable WCFab Red powder coat for long-lasting corrosion resistance and a custom look.

• 3-inch Fabricated Billet Y-Bridge
• 3-inch Passenger Side Intercooler Pipe (14g Mandrel-Bent Aluminum)
• Includes Fuel Pressure Relief Valve (FPRV) Block Off Kit for bridge clearance
• MAP Sensor Seal and Heavy-Duty Hold Down Bracket
• High-Temp Silicone Boots and Stainless Steel T-bolt Clamps
• New O-Ring Bridge Flange Gaskets included
• Compatible with factory and drop-in IHI turbos
• Made in the USA
• Manufacturer Part Number: WCF100693-RED

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

Upgrade your 2017-2019 L5P Duramax from a factory cartridge-style filter to a high-capacity spin-on canister system. The WCFab Fuel Filter Housing Kit (WCF100361) increases filtration efficiency and extends service intervals. This kit utilizes a CNC-machined billet aluminum base that installs in the factory location using OEM-style quick-disconnect fuel line fittings, ensuring a secure fit while maintaining the function of the PTC heating element for reliable cold-weather performance.

• Premium Filtration: Includes a Donaldson 4-micron fuel filter and water separator (P/N P553203) for superior engine protection.
• Billet Construction: Features a gray anodized aluminum filter base with an engraved WCFab logo for lasting durability and corrosion resistance.
• Integrated Monitoring: Includes a 1/8" NPT port, allowing for the easy addition of a fuel pressure sensor or gauge.
• Complete Kit: Comes with the filter base, distribution block, filter coupler, and required quick-disconnect fittings.
• Compatibility: Replaces GM Part #23149526 and #84711317; compatible with stock tuning.

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

Upgrade your Duramax airflow with the Wehrli Custom Fab (WCFab) Stage 2 Intake Kit. This system replaces the restrictive plastic factory intake with a high-flow, fabricated aluminum 4-inch intake pipe and a dedicated air box enclosure. By drawing cool air from the inner fender, this kit reduces intake temperatures and improves throttle response. A key component of the Stage 2 kit is the included 4.8-inch cast aluminum turbo intake horn, which eliminates the factory resonator and removes intake restrictions to improve turbo spool and top-end power.

The included dry air filter features a hydrophobic Outerwear's pre-filter cover to protect your MAF sensor and turbo from contaminants. Finished in a durable Gloss Black powder coat, this bolt-on kit requires no ECU tuning for operation. Note: 2011 model year trucks must update to a 2012-2016 spec PCV Regulating Valve for correct fitment.

• 4-inch fabricated aluminum intake pipe with smooth aerodynamic bends
• 4.8-inch high-flow cast aluminum turbo intake horn (VGT compatible)
• Enclosed air box with removable lid for easy maintenance
• Dry air filter with hydrophobic pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• Includes turbo O-ring seal, EGR gaskets, and installation hardware
• No tuning required; direct bolt-on installation
• Gloss Black powder coat finish
• Manufacturer Part Number: WCF100304-GB
• Made in the USA

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

Replace the restrictive factory plastic intake with the WCFab 4" Intake Kit, designed to maximize airflow and optimize the performance of your 6.6L LML Duramax. This kit features a fabricated aluminum intake pipe with large 4" diameter piping and smooth, aerodynamic bends. By drawing colder, denser air through the inner fender, this system reduces intake temperatures, improves throttle response, and provides a more aggressive engine and turbo sound under load.

The included air box enclosure features a removable lid for easy maintenance and visual inspection. The system utilizes a high-efficiency dry air filter protected by an Outerwear's hydrophobic pre-filter cover, keeping your MAF sensor and turbocharger compressor wheel safe from contaminants and moisture. This is a true bolt-on upgrade that requires no aftermarket tuning for operation and is finished in WCFab Red powder coat for long-term durability.

• Fabricated 4" aluminum intake pipe and air box enclosure
• High-flow dry air filter with Outerwear's hydrophobic pre-filter cover
• Heavy-duty silicone boot and stainless steel T-bolt clamps
• Custom WCFab Red powder coat finish
• No tuning required; direct bolt-on installation
• Made in the USA
• Manufacturer Part Number: WCF100194-RED

Fits 2013-2018 Ram 2500 and 3500 trucks (6.7L Cummins).

Clean up your engine bay by replacing the factory plastic radiator shroud with this Wehrli Custom Fabrication (WCFab) fabricated aluminum radiator cover. This cover is CAD-designed and precision laser-cut from heavy-duty 10-gauge aluminum sheet to ensure a perfect fit over the radiator and core support. It comes finished in a durable Gloss Black powder coat and includes a riveted-on aluminum WCFab logo for a custom look.

This radiator cover installs securely using the provided slip-nuts and 6mm stainless steel button head cap screws. It is designed specifically for use with the OEM grille; some aftermarket grilles may require trimming for clearance. This unit is also fully compatible with 2013-2015 dual radiator truck configurations.

• Constructed from 10G aluminum sheet
• Precision laser-cut and CNC bent for exact fitment
• Gloss Black powder coat finish
• Includes stainless steel mounting hardware
• Made in the USA
• Manufacturer Part Number: WCF100546-GB

Fits select 1997-2025 GM vehicles including Chevrolet Silverado/GMC Sierra, Corvette, Camaro, Tahoe, and Yukon (6.6L/2.8L Duramax and 4.8L-7.0L LS/LT Gas Engines).

Upgrade your engine bay with the Wehrli Custom Fabrication (WCFab) Billet Oil Fill Cap. Unlike plastic decorative covers that simply slip over the original part, this is a complete, CNC-machined replacement for the factory plastic unit. It features a robust machined cam lock for a secure fit and includes a fresh o-ring seal to ensure a leak-free performance. The clear anodized finish provides a durable, professional aesthetic that matches other WCFab billet accessories like coolant tank and brake reservoir caps.

• Direct OEM replacement for GM part numbers: 97350955, 97216410, 12573341, 12677347
• CNC machined from high-grade billet aluminum in the USA
• Durable clear anodized finish for corrosion resistance
• Includes high-quality replacement o-ring seal
• Precision machined cam lock engagement for exact fitment
• Discrete Wehrli Custom logo engraved on the underside
• Manufacturer Part Number: WCF100442