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

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

Maximize the efficiency of your L5P Duramax with the Wehrli Custom Fabrication (WCFab) Stage 2 High Flow Intake Bundle Kit. This comprehensive package replaces the restrictive factory intake and charge air plumbing with high-flow components designed to eliminate boost leaks and optimize aerodynamic flow. The kit upgrades the intake to a 4-inch diameter system and replaces the stock 2-piece intercooler pipes with heavy-duty aluminum versions. The driver-side (hot side) pipe is increased to 3 inches, while the passenger-side (cold side) pipe is enlarged to 3.5 inches to provide a significant volume increase over the OEM components.

Constructed in the USA from 14-gauge mandrel-bent aluminum, this kit replaces the failure-prone plastic and rubber factory sections. It features a CNC machined flange with double O-rings for a reliable seal at the intercooler and replaces the problematic OEM clip ring at the Y-bridge with a heavy-duty silicone boot and stainless steel T-bolt clamps. This bolt-on system requires no ECM tuning and retains all factory sensor connections.

• 4 in. Aluminum intake pipe with air box enclosure and dry filter assembly
• Hydrophobic Outerwears pre-filter cover to protect the MAF sensor and turbo
• 3 in. Driver-side (Hot Side) 1-piece intercooler pipe
• 3.5 in. Passenger-side (Cold Side) intercooler pipe
• CNC machined flange with double O-rings to eliminate boost leaks
• Heavy-duty 14 ga. aluminum construction with smooth mandrel bends
• High-quality silicone boots and stainless steel T-bolt clamps
• Custom Illusion Purple powder coat finish
• Made in the USA
• Manufacturer Part Number: WCF100414-IP

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

The WCFab Stage 2 High Flow Intake Bundle Kit is a comprehensive performance upgrade designed to eliminate the restrictions and failure points of the factory induction system. This kit replaces the restrictive 4-inch OEM intake and the leak-prone, multi-piece intercooler piping with heavy-duty 14-gauge mandrel-bent aluminum components. The driver-side (hot) pipe is upgraded to a 3-inch diameter 1-piece design, while the passenger-side (cold) pipe is increased to 3.5 inches, replacing the brittle plastic and rubber factory units.

Constructed for durability and maximum airflow, the kit includes a high-flow dry filter assembly housed in a custom air box with a removable lid for easy maintenance. The intake features a CNC-machined flange with double O-rings and a 4-inch turbo inlet horn with an integrated PCV port and surge ring. Finished in a signature WCFab Candy Red powder coat, this bolt-on kit requires no tuning and maintains all factory sensor connections.

• 4 in. Aluminum intake pipe with air box enclosure and dry filter
• Outerwears hydrophobic pre-filter cover included
• 3 in. Driver-side (Hot) intercooler pipe
• 3.5 in. Passenger-side (Cold) intercooler pipe
• CNC machined flange with double O-rings for leak-free sealing
• Heavy-duty 14 ga. aluminum construction with mandrel bends
• Includes silicone boots, stainless steel T-bolt clamps, and installation hardware
• Retains factory connection points and sensors; no tuning required
• Manufactured in the USA
• MPN: WCF100414-CR

Fits 1998-2018 Dodge and Ram 2500/3500 trucks equipped with the 5.9L or 6.7L Cummins diesel engine.

This WCFab X Fleece Performance Engineering Thermostat Housing is a direct-fit replacement for the factory coolant elbow, providing a significant aesthetic and functional upgrade over the original cast unit. Designed as a bolt-on solution, this housing features a gloss black powder-coated finish and includes an integrated port with a plug, allowing for custom coolant routing and auxiliary sensor placement. This part is a direct replacement for OEM part number 68145495AA and is manufactured in the USA to ensure high tolerances and reliable performance under high-stress cooling conditions.

• Direct replacement for OEM Thermostat Housing (P/N: 68145495AA)
• Integrated auxiliary port with plug for custom coolant routings
• Durable gloss black powder-coated finish
• Matches WCFab intake kits and intercooler piping
• Compatible with 5.9L and 6.7L Cummins engines
• Note: 2007.5-2012 models may require additional hardware (PE-CUMM-EBP-KIT-0712) for installation
• Manufacturer Part Number: WCF100157-GB
• Made in the USA

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

The WCFab 3.5" High Flow Passenger (Cold) Side Intercooler Pipe is a heavy-duty performance upgrade engineered to replace the failure-prone factory plastic two-piece pipe. Constructed from 14-gauge mandrel-bent aluminum, this one-piece 3.5" pipe eliminates the restrictive OEM clip-ring design in favor of a precision CNC-machined flange with double O-ring seals. This design provides a superior sealing surface at the intercooler outlet, preventing horsepower-robbing boost leaks and the common issue of blown factory boots under high-pressure conditions.

• Replaces GM Part Number: 84189332
• 3.5in 14-gauge aluminum construction for maximum durability and flow
• CNC-machined flange with double O-ring seals for a leak-free connection
• Integrated threaded bung for direct reinstallation of the OEM Intake Temperature Sensor
• Includes high-temperature silicone boots and stainless steel T-bolt clamps
• Simple bolt-on installation; no tuning or additional modifications required
• Durable Gloss White powder coat finish
• Manufacturer Part Number: WCF100530-GW

Fits 2020-2025 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 comprehensive Stage 1 cooling system upgrade designed to eliminate the restrictive and failure-prone factory plumbing between the turbo and the engine. By replacing the undersized OE plastic and rubber components with high-flow aluminum piping, this kit improves throttle response, turbo spool-up, and overall engine efficiency. The 3-inch hot-side pipe replaces the restrictive 2.5-inch factory unit and deletes the resonator for smoother airflow, while the 3.5-inch cold-side pipe replaces the weak plastic OE pipe known for boost leaks and failures under load.

Each component is manufactured in the USA from heavy-duty 14-gauge aluminum tubing featuring mandrel bends for maximum flow. The cold-side pipe utilizes a CNC-machined flange with a double o-ring seal, replacing the factory clip-ring design at the Y-bridge for a superior, leak-free connection capable of holding significantly higher boost pressures. This bolt-on kit requires no tuning and is compatible with stock trucks.

• 3-inch diameter Driver Side (Hot Side) Intercooler Pipe
• 3.5-inch diameter Passenger Side (Cold Side) Intercooler Pipe
• Heavy-duty 14-gauge aluminum construction with mandrel bends
• CNC-machined flange with double o-ring seals
• Reinforced silicone boots and stainless steel T-bolt clamps
• Custom Gloss White powder coat finish
• Retains all factory connection points and sensors
• Manufacturer Part Number: WCF100410-GW

Includes: Hot-side and cold-side intercooler pipes, silicone boots, stainless steel T-bolt clamps, o-rings, and intercooler outlet clip.

Fits select 2020-2025 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 is a Stage 1 performance upgrade designed to eliminate restrictive factory components and common failure points in the L5P Duramax charging system. This kit replaces the narrow, multi-piece OEM intercooler plumbing 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 reduces turbulence and improves airflow between the turbo and the engine for better throttle response and more efficient turbo spooling.

Engineered for durability under high-boost conditions, the driver-side (hot) pipe removes the failure-prone OEM resonator and middle boot joint. The passenger-side (cold) pipe features a CNC-machined flange with a double O-ring seal, replacing the factory plastic and rubber assembly that often leaks or fails under load. Finished in a signature Candy Teal powder coat, this bolt-on kit requires no ECU tuning and retains all factory sensor connection points.

• 3 in. Driver Side (Hot) Intercooler Pipe (14-gauge aluminum)
• 3.5 in. Passenger Side (Cold) Intercooler Pipe (14-gauge aluminum)
• CNC-machined flange with double O-ring seal for leak-free performance
• Heavy-duty reinforced silicone boots and stainless steel T-bolt clamps
• Mandrel-bent construction for optimized airflow
• Retains factory sensors and connection points
• No tuning required; compatible with stock vehicles
• Made in the USA
• Manufacturer Part Number: WCF100410-CT

Fits select 2001-2010 and 2017-2025 GM Duramax LB7, LLY, LBZ, LMM, and L5P trucks equipped with WCFab fabricated coolant tanks.

The Wehrli Custom Fabrication (WCFab) WCF206-19 Low Coolant Sensor is the correct replacement component designed specifically for use with WCFab aluminum coolant reservoirs. This sensor maintains critical cooling system monitoring after upgrading from the factory plastic tank to a high-performance fabricated unit.

• Replacement sensor for WCFab fabricated aluminum coolant tanks
• Ensures accurate low-level detection to prevent engine overheating
• Manufacturer Part Number: WCF206-19

Note: This sensor is designed strictly for use with WCFab fabricated aluminum tanks and is not compatible with OEM plastic reservoirs. This part is not for use with 2011-2016 LML Duramax engines; those applications require part number WCF206-25.

Fits 2003-2007 Dodge Ram 2500 and 3500 models equipped with the 5.9L Cummins diesel engine and factory or OEM-style turbochargers.

This Wehrli Custom Fab (WCFab) 4-inch intake kit replaces the restrictive plastic factory intake plumbing with a high-flow fabricated aluminum assembly. Designed to improve air velocity and volume, this kit enhances turbocharger spool-up, throttle response, and overall engine efficiency. The large-diameter mandrel-bent piping provides a more aggressive engine and turbo sound under load while maintaining a professional appearance under the hood with a Gloss Black powder-coated finish.

• 4" diameter fabricated aluminum intake piping for maximum air volume
• High-flow 4" dry air filter requires no oiling and is easy to maintain
• Includes Outerwear's hydrophobic pre-filter cover to repel moisture and debris
• Heavy-duty silicone boot and stainless steel T-bolt clamps for a leak-free seal
• Replaces restrictive OEM plastic intake components
• Made in the USA
• Manufacturer Part Number: WCF100346-GB

The Wehrli Custom Fab WCF203-21 is a precision replacement O-ring seal designed specifically for Borg Warner S400 turbocharger compressor cover outlet v-band flanges. This seal ensures a reliable, airtight connection at the compressor discharge, preventing boost leaks that can degrade engine performance and turbocharger efficiency.

This O-ring is a direct replacement for seals used in various WCFab turbocharger systems, including single turbo installs and compound turbo configurations for Cummins and LB7 Duramax applications.

• Fits Borg Warner S400 compressor cover outlet v-band flanges
• Maintains critical seal at the turbocharger discharge point
• High-temperature resistant material for turbocharger environments
• Manufacturer Part Number: WCF203-21

Direct Replacement for the following WCFab Kits:

• LB7 Duramax S400 Single Turbo Install Kit (WCF100489)
• 2004.5-2007 5.9L Cummins S400 High Mount 2nd Gen Swap Kit (WCF100486)
• 2003-2007 5.9L Cummins S400/Stock Twin Turbo Kit (WCF100567)
• 2003-2007 5.9L Cummins S400/S400 Side by Side Compound Turbo Kit (WCF100580)

Fits select 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models (6.6L).

The Wehrli Custom Fabrication Intake Resonator Delete Plug is a simple and effective way to clean up the engine bay of your L5P Duramax. By removing the bulky plastic factory resonator connected to the OEM intake, this plug provides a more streamlined appearance and allows for a more aggressive turbo sound. This component is designed as a direct bolt-on solution that requires no tuning or additional modifications.

Each plug is CNC-machined in the USA from high-grade 6061 billet aluminum, ensuring precise tolerances and a perfect fit into the factory intake housing. The black anodized finish provides long-lasting corrosion resistance and features a laser-engraved Wehrli Custom Fabrication logo for a professional finish.

• Material: 6061 Billet Aluminum
• Finish: Black Anodized with laser-engraved logo
• Installation: Bolt-on, replaces factory plastic resonator
• Compatibility: Works with stock intake systems; no tuning required
• Compliance: Emissions friendly
• Manufacturer Part Number: WCF100473

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

Upgrade your engine bay's reliability and aesthetics with the WCFab fabricated aluminum coolant tank kit. The factory plastic reservoirs on L5P Duramax trucks are prone to yellowing and clouding over time. More critically, the OE sensors are non-replaceable; when the sensor fails, it triggers a false low-coolant warning that requires the replacement of the entire tank assembly. Wehrli Custom Fab solves this with a durable aluminum design featuring a high-quality, cost-effective float-type sensor that is easily serviceable for the life of the vehicle.

This kit mounts directly into the OEM location using provided hardware and includes a billet aluminum sight glass for quick fluid level checks. Each tank is finished in a durable Bengal Red powder coat and topped with a black anodized billet aluminum cap. Made in the USA, this kit is the definitive fix for common cooling system headaches.

• Manufacturer Part Number: WCF100433-BR
• Fabricated aluminum construction with Bengal Red powder coat finish
• Serviceable low coolant level sensor eliminates permanent sensor failure issues
• Integrated billet aluminum coolant level sight glass
• Includes black anodized billet aluminum cap and overflow hose
• Direct replacement for GM part numbers: 84257137, 84214124, 84138913, 84174037
• Made in the USA

Fits 2017-2023 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L).

The Wehrli Custom Fabrication High Flow Turbo Pedestal Kit (WCF100185) is a heavy-duty performance upgrade designed for the L5P and L5D Duramax engines. This kit replaces the restrictive factory turbocharger mount to streamline exhaust flow, reducing backpressure and helping to lower Exhaust Gas Temperatures (EGTs) during heavy towing or high-performance use.

• High-flow design improves exhaust transition to the turbocharger
• Enhances turbocharger spool-up and throttle response
• Engineered for a precision fit with factory or upgraded turbo setups
• Durable construction built to withstand high heat and pressure cycles
• Manufacturer Part Number: WCF100185

By optimizing the path of exhaust gases into the turbine, this pedestal kit allows your 6.6L Duramax to operate more efficiently. It is a critical supporting component for owners looking to maximize the reliability and performance of their 2017-2023 GM heavy-duty diesel truck.

This Wehrli silicone reducer boot kit (WCF207-105) provides a professional-grade solution for connecting different pipe diameters in your vehicle's intake or charge-air system. The 4.5-inch long straight reducer transition is designed to bridge the gap between 2.375-inch and 3-inch tubing while maintaining a leak-free seal under high boost or vacuum conditions.

To ensure a reliable installation, this kit includes heavy-duty stainless steel T-bolt clamps. Unlike standard worm-gear clamps, T-bolt clamps provide superior clamping force and a consistent 360-degree seal, preventing the boot from blowing off under pressure.

• Inlet/Outlet: 2.375" x 3" ID
• Overall Length: 4.5"
• Material: High-temperature silicone with Wehrli logo
• Includes: (1) 3" T-Bolt Clamp and (1) 2.375"-2.5" T-Bolt Clamp
• Part Number: WCF207-105

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

The Wehrli Custom Fab (WCFab) Intercooler Outlet Boot Adapter is a precision-engineered solution for owners building custom high-flow intercooler piping or turbo kits. This adapter mounts to the passenger (cold) side outlet of the OEM or aftermarket intercooler that utilizes the factory clip-ring connection. It converts the stock slip/clip ring assembly into a 3.5-inch bead-rolled joint, allowing for a secure connection using a standard 3.5-inch silicone boot and T-bolt clamp.

Machined from billet aluminum and finished in a durable black anodize, this adapter ensures a leak-free seal and professional finish. It is an essential component for high-boost applications where the factory plastic or rubber connections are prone to failure or when custom plumbing is required.

• Manufacturer Part Number: WCF205-190
• Material: CNC Machined Billet Aluminum
• Finish: Black Anodized
• Inlet/Outlet Style: OE Clip-Ring to 3.5" Bead Roll
• Fitment Location: Intercooler Outlet (Passenger/Cold Side)
• Includes: New O-ring seals and wire retaining clip
• Origin: Made in USA

Designed for high-performance 6.7L Cummins applications, this Wehrli Custom Fab #12 JIC male fitting provides a secure, leak-free solution for the coolant port located behind the water pump. This fitting is an essential upgrade for custom cooling setups requiring a reliable JIC interface.

Precision CNC machined from high-grade billet aluminum, the fitting features a thick flange and an integrated mounting bolt tab to ensure the connection remains stable under vibration and pressure. The press-fit design incorporates a high-temperature O-ring seal to withstand the extreme thermal cycles common in diesel environments, finished with black anodizing for long-term corrosion resistance.

• CNC machined billet aluminum construction
• #12 JIC male fitting for custom coolant plumbing
• High-temperature O-ring seal for reliable performance
• Integrated mounting bolt tab for secure retention
• Durable black anodized finish
• Made in the USA
• Manufacturer Part Number: WCF205-140

Fits 2013-2015 Ram 2500 and 3500 HD trucks (6.7L Cummins) equipped with factory dual radiators.

This Wehrli Custom Fab (WCFab) upper coolant pipe replaces the factory rubber hose and failure-prone plastic Y-connector, which is a notorious leak point in the 6.7L Cummins cooling system. Fabricated from durable aluminum and finished in a gloss black powder coat, this upgrade provides a permanent solution to OEM plastic component fatigue. This kit is designed specifically for use with the original equipment RAM dual-radiator setup; please note that aftermarket radiators with non-standard inlet locations may require modification for fitment.

Features and Specifications:

• Fabricated aluminum coolant pipe construction
• Durable gloss black powder coat finish
• Includes heavy-duty stainless steel T-bolt clamps
• Includes high-temperature silicone boots
• Direct replacement for MOPAR Part Numbers: 52014722AD, 52014722AB, 52014722AC
• Made in the USA
• Manufacturer Part Number: WCF100867-GB

Fits 2013-2015 Ram 2500 and 3500 Heavy Duty trucks equipped with the 6.7L Cummins diesel engine and factory dual radiator cooling systems.

The Wehrli Custom Fabrication (WCFab) Upper Coolant Pipe is a heavy-duty solution for a common failure point on late-model Cummins engines. The factory rubber hose and plastic Y-connector are notorious for developing coolant leaks and complete failure over time due to heat cycling. This kit replaces those components with a durable, fabricated aluminum pipe designed to bolt directly to trucks with the OEM dual radiator configuration.

Finished in a resilient Bengal Red powder coat, this pipe provides a custom look while offering superior pressure resistance. The kit includes high-quality silicone boots and stainless steel T-bolt clamps to ensure a leak-free seal under demanding conditions. Please note: this part is designed specifically for use with OEM RAM dual radiators; aftermarket radiators with non-standard inlet locations may require modification.

• Manufacturer Part Number: WCF100867-BR
• Direct replacement for MOPAR Part Numbers: 52014722AD, 52014722AB, 52014722AC
• Fabricated aluminum construction eliminates failure-prone plastic Y-pipe
• Durable Bengal Red powder coat finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Made in the USA

Fits 2013-2015 Ram 2500 and 3500 HD trucks (6.7L Cummins) equipped with the factory dual radiator cooling system.

Eliminate a common failure point in your cooling system with the Wehrli Custom Fabrication (WCFab) aluminum upper coolant pipe. This kit replaces the OEM rubber upper radiator hose and its failure-prone plastic Y-connector, which is known for developing hairline cracks and leaks over time. Engineered specifically for trucks with the dual radiator configuration, this fabricated aluminum pipe provides a more robust and reliable connection between the radiators and the engine.

• Fabricated aluminum coolant pipe with integrated Y-connector
• Durable Bengal Blue powder coat finish for corrosion resistance
• High-quality silicone boots for a secure, flexible seal
• Heavy-duty stainless steel T-bolt clamps included
• Direct replacement for MOPAR part numbers 52014722AD, 52014722AB, and 52014722AC
• Made in the USA
• Manufacturer Part Number: WCF100867-BB

Note: This component is designed for use with OEM RAM dual radiators. Fitment with aftermarket radiators is not guaranteed if the inlet locations deviate from the factory design.

The Wehrli Custom Fab (WCFab) Traction Bar Install Kit WCF100842 is a heavy-duty mounting solution designed for Ford, Dodge, and universal custom applications. These brackets provide a rigid connection point to eliminate axle wrap and improve traction by welding directly to the bottom of the axle tube and the vehicle frame.

Constructed in-house for maximum durability, the kit features axle-side mounts finished with a zinc primer base coat to ensure superior corrosion resistance. Every connection is secured with high-strength Grade 8 hardware, providing the shear strength necessary for high-torque diesel and performance applications.

• Fits Ford, Dodge, and universal custom applications
• Heavy-duty weld-on axle and frame-side mounting brackets
• High-strength Grade 8 hardware for all mounting points
• Zinc primer base coat on axle mounts for enhanced durability
• Manufacturer Part Number: WCF100842

Note: This part number includes the mounting hardware and brackets only. It must be combined with traction bar base part number WCF100837 or WCF100839, depending on your specific vehicle application, for a complete installation.

Fits 2011-2019 Chevrolet Silverado and GMC Sierra 2500HD/3500HD (6.6L). This Wehrli Custom Fab (WCFab) Traction Bar Installation Kit provides the essential mounting hardware to secure your traction bars to the chassis and axle. Designed for heavy-duty applications, these brackets help eliminate axle wrap and improve power delivery to the ground.

This kit features axle-side mounts that bolt directly to the bottom of the axle tube using your existing axle u-bolts, paired with frame-side mounts that must be welded to the vehicle frame for maximum structural integrity. The axle-side brackets include a durable zinc primer base coat and a high-quality powder-coated finish for superior corrosion resistance. All connection points utilize high-strength Grade 8 hardware to ensure long-lasting performance under load.

• Configuration: Bolt-on axle mounts and weld-on frame mounts
• Finish: Powder-coated axle mounts with zinc primer base coat
• Hardware: Complete Grade 8 hardware set included
• Component Requirement: This part number (WCF100841) is the mounting hardware only. It must be combined with Traction Bar base part number WCF100837 or WCF100839 (depending on vehicle application) for a complete system.
• MPN: WCF100841

Fits select 2001-2010 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 trucks (6.6L Duramax).

Secure your suspension and eliminate performance-robbing axle wrap with the Wehrli Custom Fabrication (WCFab) Traction Bar Install Kit. Engineered for high-output diesel applications, these brackets provide the robust mounting points required to stabilize the rear housing during heavy acceleration or towing. The kit utilizes axle-side brackets that bolt directly to the bottom of the axle tube via the factory u-bolts, paired with front frame-side mounts designed for a permanent, weld-on installation.

Each component is built in-house at WCFab and finished with a zinc primer base coat and durable powder coating for maximum corrosion resistance. This kit includes all necessary Grade 8 hardware to connect the traction bars to the mounts.

Important Note: This part number (WCF100840) includes mounting hardware and brackets only. To complete the system, this must be combined with traction bar base part number WCF100837 or WCF100839, depending on your vehicle application.

• Axle-side bolt-on mounts (attaches via axle u-bolts)
• Frame-side weld-on mounts
• Zinc primer base coat with powder-coated finish
• High-strength Grade 8 mounting hardware included
• Manufacturer Part Number: WCF100840

WCFab Universal Fabricator Series 68-inch Traction Bars are designed to prevent axle wrap and twisting in high-horsepower truck applications. By stabilizing the axle housing, these bars protect critical driveline components, including U-joints, driveshafts, and axle tubes, from failure under heavy torque loads.

This Fabricator Series kit features a hybrid joint design for optimal performance. The frame-side utilizes rebuildable and greaseable RockJock Johnny Joint heim connections for maximum articulation, while the axle-side is equipped with heavy-duty polyurethane bushings to dampen noise and vibration—a common drawback of dual-heim setups. Each bar is finished with a multi-stage process, including an epoxy primer base coat and a professional gloss black powder coat for superior corrosion resistance.

• Manufacturer Part Number: WCF100839-GB
• Length: 68 inches (Heavy-Duty Fabricator Series)
• Frame Connection: RockJock Johnny Joint heim connections
• Axle Connection: Heavy-duty polyurethane bushings
• Finish: Gloss Black powder coat over epoxy primer base
• Construction: Made in the USA
• Note: Frame mounts, axle mounts, and installation hardware are sold separately for custom fabrication

Prevent axle wrap and protect your drivetrain with the WCFab Fabricator Series 60in Universal Traction Bars. Engineered for high-horsepower truck builds, these bars stop the axle housing from twisting under load—a critical upgrade to prevent broken U-joints, snapped driveshafts, and twisted axle housings. This universal kit is designed for fabricators, providing the core components needed to build a custom traction bar setup for your specific application.

Construction features heavy-duty tubing with a hybrid end-link design. The frame-side connections utilize rebuildable and greaseable RockJock Johnny Joint heim connections for superior articulation, while the axle-side ends use heavy-duty polyurethane bushings to minimize the noise and vibration common with dual-heim setups. Every bar is finished in-house with a multi-stage process, including an epoxy primer base coat that provides ten times the corrosion resistance of standard powder coating.

• Part Number: WCF100837-GB
• Length: 60 Inches
• Series: Fabricator Series Universal
• Finish: Gloss Black Powder Coat (Epoxy Primer Base)
• Frame Side: RockJock Johnny Joint (Greaseable/Rebuildable)
• Axle Side: Heavy-Duty Polyurethane Bushing
• Origin: Made in USA

Note: This is a universal component kit. Frame and axle mounts and installation hardware are sold separately to allow for custom application mounting.

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks. This WCFab traction bar mounting kit is designed to eliminate axle wrap and improve power delivery to the ground. Built in-house, these brackets are engineered for heavy-duty use, featuring a bolt-on axle mount that secures to the bottom of the axle tube via the factory u-bolts and a weld-on frame mount for maximum structural integrity.

This is a mounting hardware kit only and must be paired with traction bar base part number WCF100837 or WCF100839 (depending on your specific vehicle application) for a complete installation. The axle-side mounts are finished in a durable powder coating with a protective zinc primer base coat to resist corrosion in harsh environments.

• Manufacturer Part Number: WCF100831
• Mounting Style: Bolt-on axle mounts / Weld-on frame mounts
• Hardware: High-strength Grade 8 hardware included
• Finish: Powder coated with zinc primer base (axle side)
• Hand-built in the USA by Wehrli Custom Fabrication

Fits the following vehicles:

Fits 2017-2023 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

Specifically engineered for competition-ready and tuned L5P Duramax trucks, the Wehrli VGT Exhaust Housing Heat Blanket provides essential thermal management for VGT-style turbochargers. By containing radiant heat within the turbocharger housing, this blanket improves exhaust gas velocity while protecting sensitive under-hood components from extreme heat soak during high-load operation.

• Internal Heat Rating: Rated to withstand over 2500°F direct heat
• Exterior Shell: Durable, high-temperature resistant material for longevity
• Fasteners: Includes stainless steel rivet fasteners for a secure installation
• Performance: Significantly decreases under-hood temperatures and improves turbo efficiency
• Manufacturing: Handmade in the USA
• Manufacturer Part Number: WCF100822

The Wehrli Custom Fabrication WCF100800 Universal 1-inch T4 Spacer Plate Kit provides necessary clearance for custom turbocharger configurations. This divided T4 spacer is engineered to lift the turbocharger away from the manifold or engine components, preventing interference while maintaining exhaust pulse separation for optimal spool characteristics.

Precision-machined from heavy-duty steel, the spacer features a high-temperature black ceramic coating to resist corrosion and manage extreme thermal loads. This comprehensive kit includes extended M10 hardware and gaskets required for a leak-free installation between the manifold and the turbocharger turbine housing.

• 1-inch thick steel divided T4 spacer plate
• High-temperature black ceramic coating for thermal protection
• (4) M10 x 2.5" mounting studs with matching nuts and washers
• (2) T4 gaskets for a complete seal
• Manufacturer Part Number: WCF100800

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