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

Replace the leak-prone, 16-gauge factory passenger side up pipe in your LB7 Duramax with this heavy-duty 2-inch stainless steel upgrade from WCFab. Designed specifically for single turbo applications where the turbo is mounted in the factory valley location, this up pipe features a significantly thicker 11-gauge wall construction and an upgraded HD stainless bellow. Unlike the thin OEM bellows that are prone to cracking and exhaust leaks, the WCFab design provides long-term durability and handles the high heat and pressure of performance diesel applications.

The larger 2-inch diameter improves exhaust flow compared to the restrictive stock pipe, helping to decrease Exhaust Gas Temperatures (EGTs) and improve turbo spool-up response. This up pipe is engineered to clear conventional downpipes behind the engine and is fully TIG welded for maximum strength and precision fitment.

• Manufacturer Part Number: WCF100654
• Replaces GM Part Number: 97302261
• Material: 11-Gauge Stainless Steel
• Finish: Raw Stainless
• Bellow Type: Heavy Duty Stainless Bellows
• Design: Fully TIG Welded
• Fitment Note: Compatible with OEM exhaust manifolds or WCFab Billet Exhaust Manifolds (WCF100363) only
• Included: (1) Passenger Side Up Pipe, (2) Up Pipe Gaskets

Fits 2001-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 (6.6L Duramax LB7, LLY, LBZ, LMM, and LML).

Replace the thin, failure-prone 16-gauge factory driver-side up pipe with this heavy-duty 2-inch upgrade from Wehrli Custom Fabrication. This up pipe is engineered to solve the common cracking and leaking issues found in original equipment (OE) bellows, specifically improving turbo spool-up and managing exhaust gas temperatures (EGTs). Constructed from 11-gauge stainless steel, this component is fully TIG-welded to withstand the thermal stress of both single and compound turbo configurations.

• Heavy-Duty Construction: 11 GA stainless steel 2-inch diameter tubing for maximum durability.
• Improved Bellows: Features a reinforced stainless steel bellows that resists cracking under high pressure and heat.
• Turbo Compatibility: Works with any single or compound turbo setup that utilizes factory-style mounting points.
• Manifold Fitment: Compatible with OEM exhaust manifolds or WCFab Duramax Billet Exhaust Manifolds (Part #WCF100363).
• Direct Replacement: Replaces GM part numbers 98066019, 12637379, and 12634564.
• Complete Kit: Includes two (2) up pipe gaskets.

Note: 2007.5-2010 LMM models require a coolant bypass/relocation fitting (WCF100798) for proper installation. Made in the USA.

Fits select 2001-2004 Chevrolet Silverado and GMC Sierra 2500 HD/3500 (6.6L LB7 Duramax) equipped with compound or twin turbocharger systems.

Replace the leak-prone, lightweight factory passenger side up pipe with this heavy-duty solution from Wehrli Custom Fab. Engineered specifically for compound/twin turbo applications, this 2-inch up pipe features sweeping, less aggressive bends to optimize exhaust flow, increase turbo spool-up, and help reduce Exhaust Gas Temperatures (EGTs). Constructed from 11-gauge stainless steel with heavy-duty bellows, it is designed to withstand the heat and pressure of high-performance diesel builds where the factory bellows typically crack and fail.

• Part Number: WCF100648
• Construction: 11-gauge stainless steel, fully TIG welded
• Diameter: 2-inch high-flow design
• Application: Compatible ONLY with compound/twin turbo setups; will not clear conventional single turbo downpipes
• Compatibility: Fits factory exhaust manifolds or WCFab Duramax Billet Exhaust Manifolds (WCF100363)
• Includes: (1) Passenger side up pipe and (2) gaskets
• Origin: Made in USA

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

The Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit provides a durable and aesthetically superior alternative to the fragile, factory-installed plastic reservoir. Engineered as a direct bolt-on replacement, this kit mounts to the factory locations using OEM mounting points, requiring no modifications to your truck. The fabricated aluminum construction eliminates the risk of cracks and leaks common with aged plastic units while the sight glass allows for immediate fluid level verification.

This kit is finished in a durable WCFab Red powder coat and features a black anodized CNC-machined billet aluminum cap. For full functionality, WCFab includes a new low coolant level sensor and overflow hose, ensuring a complete, professional installation that integrates perfectly with your Duramax engine bay.

• Fabricated aluminum construction for maximum durability
• Durable WCFab Red powder coat finish
• Integrated coolant level sight glass
• Black anodized CNC-machined billet aluminum cap
• Includes low coolant level sensor and overflow hose
• Installs in factory location with basic hand tools
• Replaces GM part numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Manufacturer Part Number: WCF100647-RED

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

Replace the factory clear plastic coolant reservoir that is prone to yellowing and cracking with this Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. Built from durable fabricated aluminum, this tank is a direct bolt-on upgrade that mounts to factory locations using basic hand tools. Finished in a high-gloss white powder coat, it provides a significant engine bay aesthetic upgrade while maintaining the utility of a built-in coolant level sight glass.

This comprehensive kit includes a black anodized CNC machined billet aluminum cap, a pre-installed low coolant level sensor, and all necessary hardware for a seamless installation on stock trucks. It is designed to be fully compatible with the 6.6L Duramax LML cooling system and requires no permanent modifications to the vehicle.

• Fabricated aluminum construction with Gloss White powder coat finish
• Integrated coolant level sight glass for easy fluid checks
• Black anodized billet aluminum cap and overflow hose included
• Pre-installed low coolant level sensor prevents dash warnings
• Direct replacement for GM part numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Manufacturer Part Number: WCF100647-GW

Fits 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models equipped with the 6.6L LML Duramax diesel engine.

The Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit replaces the fragile, discolored factory plastic reservoir with a heavy-duty fabricated aluminum unit. Designed to bolt directly to the factory mounting points, this kit cleans up the engine bay while providing superior durability against the heat and pressure cycles of the cooling system. Each tank features a built-in sight glass for quick fluid level inspections and a custom powder-coated Gloss Black finish.

• Fabricated Aluminum Construction: TIG-welded for maximum strength and a precision fit.
• Complete Solution: Includes a black anodized CNC-machined billet aluminum cap, low coolant level sensor, and overflow hose.
• Installation: Direct bolt-on replacement; uses basic hand tools and factory mounting locations.
• Finish: Durable Gloss Black powder coat for a professional, long-lasting look.

• Manufacturer Part Number: WCF100647-GB
• Replaces OE GM Part Numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Included Hardware: Sight glass, low coolant sensor, billet cap, overflow hose, and mounting hardware

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

Replace the failure-prone factory plastic reservoir with the Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. This fabricated aluminum tank is designed to bolt directly into the factory mounting location using basic hand tools, offering a significant upgrade in both durability and engine bay aesthetics. Finished in a custom WCFab Red two-stage powder coat, this kit includes a CNC-machined black anodized billet aluminum cap and a built-in sight glass for quick coolant level checks.

Engineered for versatility, this tank is compatible with stock or drop-in turbochargers and is specially shaped to provide necessary clearance for larger aftermarket or compound turbocharger configurations. The kit includes a pre-installed low coolant sensor and all necessary mounting hardware for a seamless installation.

• Fabricated aluminum construction for superior durability
• Two-stage WCFab Red powder coat finish
• Black anodized CNC-machined billet aluminum cap
• Integrated coolant level sight glass
• Includes low coolant sensor and overflow hose
• Mounts to factory location with included hardware
• Manufacturer Part Number: WCF100628-RED

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

Replace the factory plastic reservoir with the Wehrli Fabricated Aluminum Coolant Tank Kit. This heavy-duty upgrade eliminates the brittle clear plastic OE tank that is prone to cracking and discoloration over time. Engineered for direct OEM placement, this tank bolts to factory mounting points and is compatible with stock trucks, drop-in turbos, or larger aftermarket and compound turbocharger configurations.

Finished in a durable Gloss Black powder coat, this kit includes a high-quality sight glass for quick fluid level checks and a CNC-machined black anodized billet aluminum cap. The kit is designed for a straightforward installation using basic hand tools and includes all necessary mounting hardware, an overflow hose, and a new low coolant sensor to ensure seamless integration with your Ram's monitoring system.

• Direct replacement for plastic OEM coolant reservoir
• Durable fabricated aluminum construction
• Gloss Black single-stage powder coat finish
• Integrated sight glass for easy level monitoring
• Includes black anodized CNC machined billet aluminum cap
• Compatible with stock, drop-in, and compound turbo setups
• Includes low coolant sensor and overflow hose
• Uses factory mounting points for easy installation
• Manufacturer Part Number: WCF100628-GB

Fits 2013-2018 Ram 2500 and 3500 (6.7L Cummins) trucks across all trim levels including Laramie, Tradesman, and SLT.

Replace the factory clear plastic reservoir in your engine bay with this Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. This fabricated aluminum tank is designed to bolt directly to the factory mounting points, providing a durable and aesthetically superior solution to the prone-to-fail OE plastic tank. Finished in a durable Candy Red two-stage powder coat, this kit is compatible with stock or drop-in turbochargers and provides necessary clearance for larger aftermarket or compound turbocharger configurations.

The kit features a built-in coolant level sight glass for easy maintenance checks and includes a premium black anodized CNC machined billet aluminum cap. Installation is straightforward using basic hand tools and original mounting locations.

• Manufacturer Part Number: WCF100628-CR
• Fabricated aluminum coolant tank construction
• Two-stage Candy Red powder coat finish
• Black anodized CNC machined billet aluminum cap
• Integrated coolant level sight glass
• Includes low coolant sensor and overflow hose
• Mounting hardware included
• Compatible with factory mounting points

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

Replace the failure-prone or unsightly clear plastic factory reservoir with this Wehrli Custom Fabrication (WCFab) heavy-duty fabricated aluminum coolant tank. Engineered as a direct bolt-on replacement, this kit mounts to the factory OEM locations and is designed to provide additional clearance for larger aftermarket or compound turbocharger setups while remaining compatible with stock trucks.

The kit features a durable Bengal Red single-stage powder-coated finish and includes a CNC-machined black anodized billet aluminum cap. A built-in sight glass allows for quick visual fluid level checks, and the kit comes complete with a low coolant sensor and necessary hardware to ensure a seamless installation using basic hand tools.

• Fabricated aluminum construction with Bengal Red powder-coated finish
• Black anodized CNC-machined billet aluminum cap
• Integrated coolant level sight glass for easy monitoring
• Includes low coolant sensor, overflow hose, and mounting hardware
• Provides clearance for large single and compound turbo setups
• Direct fit for OEM mounting points; no modifications required
• Manufacturer Part Number: WCF100628-BR

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

The Wehrli Custom Fabrication (WCFab) 2" Stainless Steel Up Pipe Kit is a heavy-duty solution for the restrictive and leak-prone factory components. Replacing the lightweight 16-gauge, 1 5/8" OEM pipes, this kit utilizes 11-gauge 2-inch stainless steel tubing to provide a 26% increase in flow. This improved efficiency results in faster turbo spool-up and lower exhaust gas temperatures (EGTs) under load.

Built for durability, these pipes feature heavy-duty stainless steel bellows that resist the cracking common with factory units. This is a direct bolt-on kit that requires no ECM tuning and remains compatible with factory exhaust manifolds or WCFab Billet Exhaust Manifolds (WCF100373).

• Construction: Fully TIG-welded 11-gauge stainless steel
• Diameter: 2.0" (Upgraded from 1.625" OEM)
• Flow Rating: 26% better than OEM
• Bellows: High-duty stainless steel
• Installation: Bolt-on, no tuning or modifications required
• Included Hardware: Driver and passenger side up pipes, (4) Up pipe gaskets
• Manufacturer Part Number: WCF100624
• Origin: Made in USA

Replaces GM Part Numbers: 12688021, 12702943, 12681437, 12680270, 12681162, 12674813, 12676611.

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

Eliminate the common failure point of the factory 1-5/8 inch, 16-gauge up pipes with the Wehrli Custom Fabrication (WCFab) 2-inch Stainless Up Pipe Kit. Designed for high-performance single turbo applications and factory exhaust manifolds, these pipes are constructed from heavy-duty 11-gauge stainless steel to withstand higher temperatures and pressures. The upgraded 2-inch diameter increases turbo spool-up and helps reduce exhaust gas temperatures (EGTs) by improving flow efficiency.

This kit features heavy-duty stainless bellows engineered to resist the cracking and leaking common in OEM units. Every pipe is fully TIG-welded for maximum durability in extreme environments. Note: These up pipes are compatible only with OEM exhaust manifolds or WCFab Duramax Billet Exhaust Manifolds (WCF100363). While designed for a direct fit with WCFab downpipes, use with OEM or other aftermarket downpipes may require additional modifications.

• Heavy-duty 11-gauge stainless steel construction
• Increased 2-inch diameter for improved flow and spool-up
• Reinforced stainless steel bellows prevent common exhaust leaks
• Fully TIG-welded for superior joint strength
• Includes (4) high-quality up pipe gaskets
• Replaces GM Part Numbers: 97223167, 97302261
• Manufacturer Part Number: WCF100590
• Made in the USA

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

Upgrade your L5P Duramax engine bay with the Wehrli Custom Fabrication (WCFab) Upper Coolant Pipe. This kit replaces the factory rubber upper radiator hose with a premium, fabricated aluminum hard pipe, finished in a durable Gloss White powder coat. This hard pipe solution eliminates the expansion and potential failure points of the original equipment while significantly improving under-hood aesthetics.

• Direct replacement for GM Part Numbers: 84813629, 85122989
• Fabricated aluminum construction for maximum durability
• Gloss White powder coat finish for corrosion resistance and a custom look
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps for a secure, leak-free seal
• Bolt-on installation with basic hand tools; no modifications required for stock trucks
• Designed specifically for use with the OEM GM radiator

Note: This component is intended for use with factory radiators. Fitment cannot be guaranteed with aftermarket radiator units. Includes aluminum coolant pipe, silicone boots, and T-bolt hardware. Manufacturer Part Number: WCF100541-GW.

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-inch High Flow Passenger Side (Cold Side) Intercooler Pipe addresses the common failure points of the factory charging system. This one-piece upgrade replaces the restrictive, multi-piece OEM plastic pipe with mandrel-bent 14-gauge aluminum tubing. By eliminating the factory clip-ring design in favor of a CNC-machined flange with double O-ring seals and heavy-duty silicone boots, this pipe provides a secure connection that withstands increased boost pressures without leaking or blowing off.

Designed for a seamless installation, this kit includes a threaded bung to retain your original Intake Air Temperature (IAT) sensor and requires no aftermarket tuning. It is a direct bolt-on replacement for GM part number 84189332, offering improved reliability and airflow for both stock and modified trucks.

• 3.5-inch 14-gauge aluminum construction for maximum flow
• CNC-machined flange with double O-ring seals eliminates boost leaks
• High-quality silicone boot and stainless steel T-bolt clamps included
• Integrated threaded bung for OEM IAT sensor
• Durable WCFab Grey powder coat finish
• Replaces GM Part Number: 84189332
• Manufacturer Part Number: WCF100530-GRY

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

Upgrade your L5P Duramax charge air system with the WCFab 3.5-inch High Flow Passenger (Cold) Side Intercooler Pipe. This high-performance component replaces the restrictive factory two-piece plastic pipe with a rigid, one-piece 14-gauge aluminum design. Engineered to handle increased boost pressures, this upgrade eliminates the common failure points of the OEM assembly, such as blown factory boots and horsepower-robbing boost leaks.

The pipe features a precision CNC-machined flange with a double o-ring seal to ensure a superior connection at the intercooler outlet. It includes an integrated threaded bung to facilitate the reinstallation of the factory Intake Temperature Sensor. Finished in a durable Gloss Black powder coat, this pipe provides a clean look and a reliable, bolt-on installation that requires no additional tuning or vehicle modifications.

• Replaces OEM GM Part Number: 84189332
• 3.5-inch 14 ga. aluminum construction for maximum flow and durability
• CNC machined flange with double O-rings for leak-free sealing
• Includes heavy-duty silicone boot and stainless steel T-bolt clamps
• Integrated threaded bung for OEM Intake Temperature Sensor
• No tuning or modifications required for installation
• Manufacturer Part Number: WCF100530-GB

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

Upgrade your cooling system with the Wehrli Custom Fabrication (WCFab) Aluminum Upper Coolant Pipe. This high-performance component is designed to replace the factory rubber upper radiator inlet hose, which is prone to degradation and failure under high heat and pressure. Constructed from mandrel-bent aluminum and finished in a durable Gloss White powder coat, this pipe ensures a reliable connection while significantly enhancing your engine bay's appearance.

• MPN: WCF100517-GW
• Material: Mandrel-bent aluminum
• Finish: Gloss White powder coat
• Inclusions: Heavy-duty silicone boots and stainless steel T-bolt clamps
• Replaces: OEM rubber radiator inlet hose
• Radiator Compatibility: For use with OEM RAM radiators (aftermarket radiators may require modification if inlet locations vary)

Note: This part is not for use on 2013-2015 models equipped with dual radiators or twin CP3 pump configurations.

Replaces MOPAR Part Numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, 68227796AA.

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

The Wehrli Custom Fabrication WCF100517-GB Upper Coolant Pipe replaces the factory rubber radiator inlet hose with a rigid, mandrel-bent aluminum alternative. Designed for 6.7L Cummins-equipped HD trucks, this upgrade eliminates the risk of hose failure or swelling under pressure while significantly enhancing the appearance of the engine bay with a durable gloss black powder-coated finish.

This component is engineered for use with the OEM RAM radiator. Please note that fitment is not verified for 2013-2015 models equipped with dual radiators or vehicles utilizing a twin CP3 pump configuration. This kit provides a clean, professional installation by utilizing high-quality silicone boots and stainless steel T-bolt clamps.

• Construction: Mandrel-bent aluminum tubing
• Finish: Durable Gloss Black powder coat
• Included Hardware: Heavy-duty silicone boots and T-bolt clamps
• Replaces MOPAR Part Numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, 68227796AA
• Manufacturer Part Number: WCF100517-GB

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

The Wehrli Custom Fabrication (WCF) Aluminum Upper Coolant Pipe provides a professional-grade upgrade over the failure-prone factory rubber radiator inlet hose. While OEM rubber hoses can soften, bulge, or degrade due to heat cycles and cooling system pressure, this mandrel-bent aluminum pipe offers a rigid, permanent solution. Finished in a premium Candy Red powder coat, it improves both the reliability and aesthetics of your 6.7L engine bay.

• Construction: Mandrel-bent aluminum tubing
• Finish: Durable Candy Red powder coat
• Hardware Included: High-temperature silicone boots and stainless steel T-bolt clamps
• Installation: Replaces the radiator inlet hose to factory mounting points
• Compatibility: Designed for use with OEM RAM radiators
• Manufacturer Part Number: WCF100517-CR

This pipe is a direct replacement for the following MOPAR part numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, and 68227796AA.

Fits 2013-2018 Ram 2500 and 3500 HD trucks equipped with the 6.7L Cummins engine. This kit is designed for models without dual radiators or twin CP3 pumps.

The Wehrli Custom Fab (WCFab) Upper Coolant Pipe replaces the factory-installed rubber upper radiator hose with a heavy-duty, rigid aluminum solution. This upgrade eliminates the risk of hose failure or expansion under high pressure and temperature, providing a more reliable connection to the radiator inlet. Each pipe is finished in a durable Bengal Red powder coat for long-lasting corrosion resistance and a custom under-hood appearance.

This pipe is designed specifically for use with the OEM Ram radiator; fitment with aftermarket radiators cannot be guaranteed if the inlet location deviates from factory dimensions.

• Material: High-grade aluminum piping
• Finish: Bengal Red powder coat
• Installation: Direct replacement for Mopar part numbers 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, and 68227796AA
• Includes: Aluminum coolant pipe, heavy-duty silicone boots, and stainless steel T-bolt clamps
• MPN: WCF100517-BR

Fits select 2001-2024 Chevrolet and Dodge trucks equipped with WCFab fabricated coolant tanks (6.7L).

Upgrade your engine bay with the Wehrli Custom Fabrication (WCFab) Billet Aluminum Coolant Tank Cap. Engineered as a high-durability replacement for WCFab fabricated coolant tanks, this cap is CNC-machined from premium billet aluminum to withstand the heat and pressure of high-performance cooling systems. The clear anodized finish provides a clean, professional look while offering long-term protection against corrosion.

• Precision CNC-machined billet aluminum construction
• Clear anodized finish for corrosion resistance
• Pressure rated for 18-20 PSI systems
• Direct fit for WCFab fabricated coolant tanks
• Aesthetic match for WCFab oil and brake reservoir caps
• Manufacturer Part Number: WCF100472

Fits select 2014-2020 Chevrolet Silverado/GMC Sierra 1500, 2500HD, 3500HD, Tahoe, Suburban, Yukon, and Cadillac Escalade (4.3L / 5.3L / 6.2L / 6.6L Duramax). This WCFab Transmission Cooler Thermostat Bypass Plug is a high-performance direct replacement for the failure-prone OEM thermostat found in GM 6L80, 6L90, and 8L90 transmissions.

By eliminating the restrictive factory thermal valve, this bypass plug allows for immediate and maximum fluid flow to the transmission cooler. In testing, this modification has shown fluid temperature drops of 15-50°F, protecting your transmission from the dangerous heat soak often experienced during heavy towing or in warm climate conditions. The CNC-machined billet aluminum construction ensures a precise fit and long-term durability compared to the stock plastic or cast components.

• Direct replacement for OEM part number: WCF100469
• Reduces fluid flow restriction to the transmission cooler
• CNC machined billet aluminum construction with a black anodized finish
• Equipped with high-temperature silicone O-ring seals for a leak-free fit
• Quick and easy installation; easily reversible for cold weather operation
• Recommended for both stock and built transmissions

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

Replace the failure-prone factory plastic intercooler outlet with the WCFab 3.5-inch High Flow Intercooler Outlet Elbow. Designed specifically for passenger-side applications, this kit solves the common issue of blown factory boots and horsepower-robbing boost leaks. Built from 14-gauge fabricated aluminum, the 3.5-inch diameter ensures maximum airflow to accommodate increased performance demands.

This kit features a CNC-machined billet aluminum flange with a double O-ring seal to provide a superior sealing surface compared to the OEM component. For installation on high-boost applications, it includes an upgraded heavy-duty silicone reducer boot and stainless steel T-bolt clamps. The gloss black powder coat finish provides a durable, professional look that resists corrosion.

• Fabricated 14-gauge 3.5" aluminum piping
• CNC-machined billet aluminum flange with double O-rings
• Heavy-duty 3.5" to 3" silicone reducer boot
• Includes stainless steel T-bolt clamps and new wire clip ring
• High-gloss black powder coat finish
• Manufacturer Part Number: WCF100466-GB

Note: Specifically designed for use with aftermarket intercooler piping and turbo kits requiring a bead roll connection at the intercooler outlet.

Fits 2001-2010 Chevrolet Silverado and GMC Sierra 2500/3500 HD and Classic models (Gas and Diesel).

The WCFab Lower Splash Shield Kit is a rugged, aluminum upgrade designed to replace the brittle factory plastic shields that are notorious for cracking and breaking on heavy-duty GM trucks. By replacing the thin OEM unit, this kit provides significantly increased protection for the lower engine bay and cooling stack against road debris and trail hazards. The shield is precision-cut from heavy gauge aluminum for maximum durability without excessive weight.

This kit is engineered for a straightforward installation, utilizing factory mounting points with integrated standoffs for a secure frame fitment. It features a unique design that provides more coverage than the original part and includes specific brackets to ensure proper support for the lower radiator hose. Finished in a durable Fine Texture Black powder coat, it offers a clean, professional appearance that matches factory trim.

• Replaces GM Part Numbers: 22781372, 15049191, 15152798, 15745156
• Constructed from heavy gauge aluminum for superior impact resistance
• Includes new flanged head mounting hardware
• Incorporates lower radiator hose support brackets
• Bolts directly to OEM mounting points with basic hand tools
• Made in USA
• Manufacturer Part Number: WCF100463-FTB

Fits 2015-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks (Gas and Diesel).

The WCFab 3/4-inch Front Bumper Spacer Kit is engineered to resolve tire clearance issues on the 2015-2019 GM Heavy Duty platform. By moving the front bumper forward 0.750 inches, this kit provides additional room within the wheel opening, allowing for the installation of wider and taller wheel and tire combinations, specifically those with aggressive negative offsets. This modification significantly reduces or eliminates the need for trimming factory plastic and metal components.

Precision CNC machined from billet aluminum, these spacers are designed to maintain maximum mounting surface area against the frame horns for structural integrity. The components are finished in a durable flat black powder coat for superior corrosion resistance and a clean, factory-like appearance under the front end.

• Provides 3/4 inch (0.750") of additional front bumper clearance
• CNC machined billet aluminum construction
• Durable flat black powder coat finish
• Includes high-quality mounting hardware
• Bolts to factory mounting points with basic hand tools
• Made in the USA
• Manufacturer Part Number: WCF100462

Fits 2015-2019 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD (Gas and Diesel).

The WCFab 3/8-inch Front Bumper Spacer Kit provides the necessary clearance to run wider and taller wheel and tire combinations without aggressive trimming of OEM components. By moving the front bumper forward 0.375 inches, these spacers create additional room in the wheel opening to prevent rubbing, especially on setups with negative offsets.

Precision CNC machined from billet aluminum, these spacers are designed to maintain maximum mounting surface area against the frame horns for structural integrity. Each piece is finished in a durable flat black powder coat to resist corrosion and match the factory chassis finish. This kit is a direct bolt-on solution that utilizes your truck's factory mounting hardware and installs easily with standard hand tools.

• Bore/Thickness: 3/8 in. (0.375")
• Material: CNC Machined Billet Aluminum
• Finish: Flat Black Powder Coat
• Installation: Reuses factory mounting hardware
• MPN: WCF100453
• Origin: Made in USA

Fits select 2020-2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks.

The Wehrli Custom Fab (WCFab) 3/4-inch Front Bumper Spacer Kit provides the clearance necessary for aggressive wheel and tire combinations on late-model GM heavy-duty trucks. CNC machined from billet aluminum, these spacers move the front bumper forward 0.750 inches off the factory frame horns. This adjustment increases the wheel opening area to accommodate wider and taller tires with negative offsets, helping to prevent rubbing and reducing the need for trimming OEM components.

Built with structural integrity in mind, these spacers maintain a maximum mounting surface area against the frame. The kit is finished in a durable flat black powder coat for superior corrosion resistance and an OEM-style appearance. Installation is simple and can be completed with basic hand tools. For vehicles requiring a less aggressive offset, a 3/8-inch kit (MPN: WCF100446) is also available.

• Increases tire clearance by moving front bumper 3/4 in. forward
• CNC machined billet aluminum construction
• Durable flat black powder coat finish
• Compatible with both gas and diesel HD models
• Includes high-quality mounting hardware
• Made in the USA
• Manufacturer Part Number: WCF100444

Fits select 1997-2025 Chevrolet, GMC, Cadillac, Hummer, and Pontiac vehicles equipped with Duramax diesel engines (6.6L / 2.8L) or LS-series gasoline V8s (4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L).

Upgrade your engine bay with the WCFab Billet Aluminum Oil Fill Cap. Unlike simple cosmetic covers that slide over existing parts, this is a complete, one-piece direct replacement for the fragile factory plastic cap. Precision CNC-machined in the USA from high-quality billet aluminum, it provides a secure, leak-free seal while significantly improving the aesthetics of your Duramax or LS-based engine.

Each cap features a durable black anodized finish for superior corrosion resistance and a precision-machined cam-lock engagement system to ensure a perfect fit. The underside is engraved with the Wehrli Custom logo, and the unit includes a new O-ring seal for a tight lock against the valve cover or fill neck. It is designed to match other WCFab billet reservoir caps for a cohesive engine bay look.

• Direct OEM replacement for GM part numbers: 97350955, 97216410, 12573341, 12677347
• CNC machined from billet aluminum in the USA
• Black anodized finish for maximum durability
• Precision machined cam-lock engagement
• Includes pre-installed O-ring seal
• Installs in seconds with no tools required
• Manufacturer Part Number: WCF100443