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Clean up the engine bay of your 1998.5-2023 Cummins with this Billet Aluminum Black Anodized Oil Fill Cap from WCFab. This is a complete cap, not a cover. Direct OEM replacement for the factory plastic part. Includes o-ring seal. CNC machined in the USA.***Not compatible with WCFab X D&J Billet ...

Clean up the engine bay of your 1998.5-2023 Cummins with this Billet Aluminum Clear Anodized Oil Fill Cap from WCFab. This is a complete cap, not a cover. Direct OEM replacement for the factory plastic part. Includes o-ring seal. CNC machined in the USA.***Not compatible with WCFab X D&J Billet ...

Clean up the engine bay of your 1998.5-2023 5.9L or 6.7L Cummins truck with this black anodized billet aluminum brake reservoir cap from WCFab. This is a complete cap, not a cover. CNC machined in the USA from billet aluminum.- CNC Machined Billet Cap is a direct OEM Replacement, not a cover- Made i...

Replace the lightweight, leak-prone passenger side OEM up pipe with this heavy-duty 11 gauge 2" Stainless up pipe. HD Stainless Bellow that will not crack and leak like OEM. Increase Turbo spool up and decrease EGTs. This up pipe is built to clear a conventional downpipe behind the engine in single ...

Replace the lightweight, leak-prone, 1 5/8" OEM up pipes with these heavy-duty 11 gauge 2" Stainless up pipe kit. HD Stainless Bellows that will not crack and leak like OEM. Increase Turbo spool-up and decrease EGTs. This kit is for use with single turbo applications and factory exhaust manifolds.IN...

2001-2010 LB7, LLY, LBZ, LMM Crew Cab Duramax Fass Fuel System Relocation Mounting Bracket. Relocates the FASS fuel system to underneath the truck on the inside of the driver side frame rail.**NOT COMPATIBLE on regular cab or extended cab models**-Mount Bracket-Grade 8 Hardware-Zinc primer & Sem...

Replace the lightweight, leak-prone Driver side OEM up pipe with this heavy-duty 11 gauge 2" Stainless up pipe. HD Stainless Bellow that will not crack and leak like OEM. Increase Turbo spool up and decrease EGTs. Will work with ANY Turbo setup, single or compound, compatible with factory exhaust ma...

WCFab’s 2001-2016 Duramax Billet Exhaust Manifolds replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components designed to enhance exhaust flow characteristics, improving turbo spool up, lowering EGTs and increasing power and economy. These manifolds...

The WCFab 2001-2016 Duramax Up Pipe Bolt Kit is comprised of 6 specially selected high strength 12 point ARP fasteners and matched washers with a pack of assembly lube and are designed as an upgrade to the OEM fasteners employed on the 2001-2016 and newer 6.6L Duramax engines to connect the up pipes...

Clean up the engine bay of your 2001-2024 Duramax with this Billet Aluminum Black Anodized Oil Fill Cap from WCFab. This is a complete cap, not a cover. Direct OEM replacement for the factory plastic part. Includes o-ring seal and machined cam lock engagement. CNC machined in the USA.Direct replacem...

Clean up the engine bay of your 2001-2024 Duramax with this Billet Aluminum Clear Anodized Oil Fill Cap from WCFab. This is a complete cap, not a cover. Direct OEM replacement for the factory plastic part. Includes o-ring seal and machined cam lock engagement. CNC machined in the USA.Direct replacem...

Aluminum Upper Coolant Pipe for 2003-2009 5.9L & 6.7L Cummins. Replaces the OEM rubber upper coolant hose and comes powder coated in your choice of colors! For use with OEM RAM radiator. Aftermarket radiators may cause fitment issues.   ***NOT COMPATIBLE WITH TRUCKS EQUIPPED WITH TW...

Replace the fragile plastic OEM fittings on the top of your 2004.5-2010 LLY/LBZ/LMM Duramax engine which are prone to damage with these high quality, black anodized, CNC machined billet aluminum fittings from WCFab. No tuning required.- Kit includes two CNC machined billet aluminum fittings with o-r...

Clean up the engine bay of your 2004.5-2022 Dodge Ram 2500/3500 truck with this custom powder coated fabricated aluminum brake reservoir cover from WCFab that fits over the unsightly OEM plastic reservoir. Pair with a WCFab billet aluminum brake reservoir cap for the completed look.***NOTE: Some 200...

Stage 1 upgrade for the 2006-2007 LBZ Duramax improves airflow between the turbo and engine for improved efficiency, throttle response, and turbo spool-up. Eliminates weak points in the factory design that can lead to boost leaks or complete failures in hard-working and high-performance applications...

Stage 2 upgrade for the 2006-2007 LBZ Duramax combines our popular Stage 1 High Flow Bundle and Stage 2 intake Kit into a single package, providing increased airflow for your turbo and engine for improved efficiency, throttle response, and turbo spool up. Eliminates weak points in the factory design...

Stage 1 upgrade for the 2007.5-2010 LMM Duramax improves airflow between the turbo and engine for improved efficiency, throttle response, and turbo spool-up. Eliminates weak points in the factory design that can lead to boost leaks or complete failures in hard-working and high-performance applicatio...

Stage 2 upgrade for the 2007.5-2010 LMM Duramax combines our popular Stage 1 High Flow Bundle and Stage 2 intake Kit into a single package providing increased airflow for your turbo and engine for improved efficiency, throttle response, and turbo spool up. Eliminates weak points in the factory desig...

Aluminum Upper Coolant Pipe for 2010-2018 6.7L Cummins replaces the OEM rubber upper coolant hose and comes powder coated in your choice of colors! For use with OEM RAM radiator. Aftermarket radiators may cause fitment issues.   ***NOT COMPATIBLE WITH 2013-2015 TRUCKS EQUIPPED WITH DUAL R...

2011-2016 LML Crew Cab Duramax Fass Fuel System Relocation Mounting Bracket. Relocates the FASS fuel system to underneath the truck just before the fuel tank.**NOT COMPATIBLE on a regular cab or extended cab models**-Mount Bracket-Zinc primer & Semi gloss black powder coat finishWCFAB: WCF1...

Replace the restrictive crushed factory down pipe on your 2011-2016 LML Duramax with this full 3" Stainless Steel down pipe. For use with factory turbo or factory style drop in turbo on trucks using a v-band connection style exhaust, NOT the 3 bolt flange style exhaust.Replaces the following GM Part...

Replace the restrictive crushed factory down pipe with this full 3" down pipe. For use with factory turbo or factory style drop in turbo.Replaces the following GM Part Numbers: 12643610, 12638304, 12643214Note: 2015.5 and newer LML have a 3 bolt flange exhaust system, this down pipe will only work i...

This quick and easy to install, billet aluminum plate allows you to clean up your engine bay in minutes by removing the big plastic resonator connected to the intake. 100% warranty and emissions friendly. CNC machined in the USA from 6061 aluminum. Black anodized finish with engraved Wehrli Custom F...

As a direct replacement for the failure prone OEM thermostat, the Transmission Cooler Thermostat Bypass Plug can drop fluid temperature from 15-50 degrees F by reducing fluid flow restriction to the trans cooler. In the stock application, we've seen the valve fail forcing trans fluid around the cool...

These kits are the perfect solution for trucks with bigger turbo kits and injectors that have reached the limits of the stock HP4 pump and are in search of more power.***Requires use of an aftermarket low pressure / CP3 compatible lift pump with 15-20PSI of pressure. Not compatible with OEM L5P in-t...

Increase fuel filter capacity and amount of time between filter changes on your 2017-2019 & 2020-2023 Long Bed L5P Duramax by upgrading from a stock cartridge style filter to our spin-on canister style filter. Featuring an anodized billet aluminum fuel filter base, this upgrade kit installs in t...

Replace the lightweight, leak prone, 1 5/8" OEM up pipes on your 2017-2023 Newer Duramax with these heavy duty 11 gauge 2" Stainless up pipe kit. HD Stainless Bellows that will not crack and leak like OEM. Increase Turbo spool-up and decrease EGT's. This kit is for use with factory exhaust manifolds...

Replace the restrictive crushed factory downpipe on your 2017-2024 L5P Duramax with this 3.5" Down Pipe for improved exhaust flow.  Black Ceramic Coated and Heat wrapped.  Down Pipe includes bungs for sensors and NO tuning required to use this downpipe. ***Connects to the DOC (Diesel ...

WCFab’s 2017-2024 Duramax Billet Exhaust Manifolds with EGR Riser Flange replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components designed to enhance exhaust flow characteristics, improving turbo spool up, lowering EGTs and increasing power and ec...

This quick and easy to install, billet aluminum plug allows you to clean up your engine bay and get more aggressive turbo sound in minutes by removing the big plastic resonator connected to your OEM intake. 100% warranty and emissions friendly. CNC machined in the USA from 6061 aluminum. Black anodi...

The WCFab L5P Up Pipe Bolt Kit is comprised of 12 specially selected high-strength ARP fasteners and matched washers with a pack of assembly lube are designed as an upgrade to the smaller and failure prone 8mm OEM fasteners employed on the 2017 and newer 6.6L Duramax engines to connect the up pipes ...

Increase fuel filter capacity and amount of time between filter changes on your 2020-2024 L5P Duramax by upgrading from a stock cartridge style filter to our spin-on canister style filter. Featuring an anodized billet aluminum fuel filter base, this upgrade kit installs in the same location as the s...

The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. Our made in the USA, billet aluminum direct-fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade.Replaces GM/AC Delco Par...

Clean up the engine bay of your 1999-2024 GM 1500/2500/3500 truck with this anodized billet aluminum brake reservoir cap from WCFab. This is a complete cap not a cover. CNC machined in the USA from billet aluminum.Direct replacement for the following GM OEM part numbers: 20760280, 22688449- CNC Mach...

Clean up the engine bay of your 1999-2024 GM 1500/2500/3500 truck with this anodized billet aluminum brake reservoir cap from WCFab. This is a complete cap not a cover. CNC machined in the USA from billet aluminum. Direct replacement for the following GM OEM part numbers: 20760280, 22688449- CN...

Replacement Dry Air Filter used in WCFab 4" Intake kits and S300 Single Install Kits.Maintenance - The cleaning / replacement interval depends on your driving conditions. We recommend that you inspect your air filter every 5,000 miles by removing the filter cover and examining the pleats. Keeping yo...

Replacement Dry Air Filter used in WCFab Twin Turbo and S400 Single Install Kits.Maintenance - The cleaning / replacement interval depends on your driving conditions. We recommend that you inspect your air filter every 5,000 miles by removing the filter cover and examining the pleats. Keeping your f...

We use and recommend these Outerwears Air Filter Covers for all WCFab air filters used in our turbo kits and intake kits. These Pre-filters are designed to deflect the damaging debris, which can prematurely clog air filters, compromising peak air-flow and horsepower. The Pre-filter also extends the ...

Black Anodized Billet Aluminum Turbo Drain Flange with #10AN Extended Drain Tube lowers the threaded connection of the oil drain line from the turbo drain port for easier access with wrench for installation. Our adapter flange to the turbo center section incorporates a reusable O-Ring seal, so no mo...

Replace the restrictive crushed factory down pipe with this full 3" Stainless steel down pipe. For use with factory turbo or factory style drop in turbo. No tuning required.-3" Stainless Steel Downpipe-Heat Wrap and Clamps-No tuning required!This product cannot ship to California.WCFAB: WCF1007...

4" Turbo Down Pipe for Cummins with High Mount style turbo on 2nd Gen style exhaust manifold. The upper flange measures 4.6" diameter to mate with S400 exhaust housing. The lower flange connects to the factory exhaust system v-band flange using the OEM v-band clamp. This down pipe is high-temperatur...

Replace the restrictive crushed factory down pipe with this full 3" down pipe. High Temp Ceramic Coated for protection. For use with factory turbo or factory style drop in turbo. No tuning required.-3" Down Pipe-Heat Wrap & Clamps-Black Ceramic Coating-No tuning required!WCFAB: WCF100120...

Replace the restrictive crushed factory down pipe on your 2015.5-2016 LML Duramax with this full 3" Stainless steel down pipe. For use with factory turbo or factory style drop in turbo on trucks with the 3 bolt flange exhaust connection.Replaces the following GM Part Numbers: 12674630, 12655717For 2...

For use on 2004.5-2016 Duramax VGT Style Turbochargers. • Easy to install blanket keeps heat inside the turbo housing• Decreases under hood temperatures• Internally rated to over 2500°F direct heat• Durable high temperature exterior shell material• Stainless steel rivet fasteners• ...

For use on all T4 Flange style exhaust housings found on S300, S400, garrett, holset, precision turbo chargers.• Easy to install blanket keeps heat inside the turbo housing• Decreases under hood temperatures• Internally rated to over 2500°F direct heat• Durable high temperature exterior she...

T6 Exhaust Housing Blanket for use with any S500, S400, GT50, GT55, Precision T6 exhaust housings.• Easy to install blanket keeps heat inside the turbo housing• Decreases under hood temperatures• Internally rated to over 2500°F direct heat• Durable high temperature exterior shell material�...

2013-2018 6.7L Cummins Fabricated Aluminum Coolant Tank Kit, mounts in OEM coolant tank location.   Dress up your engine bay by replacing the ugly clear plastic coolant reservoir with our custom powder coated fabricated aluminum coolant tank with sight glass Includes black anodized CNC...