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2020-2021 L5P Duramax 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 machined billet aluminum cap, mounting hardware, overflow hose and low coolant sensor
• Will fit on stock trucks with no other modifications necessary
• Uses OEM mounting points
• Installs easily with basic hand tools

3.5 inch Turbo Intake Horn for the 2020+ L5P Duramax with factory style Turbo. Improves air flow to turbo by removing restriction found in the factory horn right before the turbo inlet. Tuning not required, this horn will work plug and play tuners or OEM calibration.

• NO Tuning required, bolt on!
• Will fit with OEM or any aftermarket intake kit.
• Will fit on stock truck no other modifications or upgrades necessary!

The 3" High Flow Driver side Intercooler pipe for the 2020-2021 L5P Duramax. Replaces the OEM two piece design with a high flow one piece 3" pipe. It also includes upgraded silicone boots that withstand higher pressure and temperature than the factory boots to increase reliability and eliminate blown factory boots.

• NO Tuning required, bolt on!
• Will fit on stock truck no other modifications or upgrades necessary!

The WCFab 3.5" High Flow Passenger Side Intercooler Pipe for 2020-2021 L5P Duramax replaces the restricted OEM plastic two-piece design with a high flow, 14 ga. aluminum one piece 3.5" pipe. Includes black anodized CNC machined billet aluminum adapter with double o-ring seal, upgraded silicone boot, and stainless t-bolt clamps on upper connection and CNC machined flange with double o-ring seal at intercooler connection for improved pressure and temperature resistance vs. factory design.

• Increased reliability and reduced possibility of blown boots and horsepower robbing boost leaks
• No tuning required, bolt on!
• Compatible with stock trucks
• Custom powder coated in the color of your choice

Increase fuel filter capacity and amount of time between filter changes on your 2020+ 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 stock cartridge filter base using the same OEM style quick disconnect fuel line fittings.

• Ensures maximum effectiveness in cold weather by keeping the fuel flow path across the PTC heating element
• Gray anodized finish with engraved WCFab Logo
• Compatible with stock trucks, No tuning required
• Includes Donaldson 4 micron fuel filter and water separator (Donaldson P/N P553203), filter base with integral mounting, distribution filter block/filter coupler, quick disconnect fittings, and 1/8" NPT port for fuel pressure monitoring
• Replaces GM Part #13543066

Upper Coolant Pipe for 2020-2021 L5P Duramax replaces the ugly OEM rubber upper radiator hose with a fabricated aluminum hard pipe powder coated in your color of choice!

• Cleans up engine bay appearance
• Includes high quality silicone boots and stainless t-bolt clamps
• Will fit on stock trucks with no other modifications necessary
• Installs easily with basic hand tools

2020-2021 L5P Duramax 4" Intake Resonator Pipe for the Factory (VGT) Turbo.

• Dress up your engine bay and remove the plastic turbo resonator box.
• Reduces air restriction allowing more air flow to turbo
• Removes silencers for more aggressive turbo and engine sound
• No tuning required, bolt on!
• Will fit on stock trucks with no other modifications necessary.
• Installs easily with basic hand tools

***Will only fit with the OEM air filter box, NOT COMPATIBLE with the S&B, Banks, AFE, or other aftermarket air intakes***

Cognito 4” Standard Lift Package (bundled) for 2020-2021 GM 2500/3500 2WD/4WD Trucks.

We’ve bundled everything you need in a lift kit for your GM 2500/3500 with high quality Cognito components. There’s no guesswork and you SAVE with the bundled price. Cognito components are engineered, manufactured and assembled in the USA. The Cognito Non-Torsion Bar Drop Front Lift kit is designed and engineered to offer superior ride quality and corrected CV joint angles.

The Fox 2.0 Performance Series shocks contain the latest in shock technology to transform the performance of your truck. The Fox 2.0 Performance Series IFP front shocks are rust resistant and have a metal impact extruded aluminum body to increase cooling capacity. The IFP eliminates oil aeration allowing maximum performance from the factory-tuned, precision valving. They're easy to install and provide a comfortable on-road ride and predictable off-road handling in even the toughest conditions. The Cognito 2” Block and U-Bolt Kit includes 2” tall powder coated semi-gloss black cast steel blocks and heavy-duty zinc plated U-bolts Each Kit Features:

For assistance selecting the correct parts for your truck, or a quote for custom powder coated parts, please call 630-277-8239 to speak with one of our specialists.

Results in torque and power gains across the full operating rpm range, starting right off idle and marching to the shift point in each gear. Derringer is dyno calibrated to use multiple data inputs such as throttle position, rpm, vehicle speed, AFR, knock, coolant temperature, and EGT, just like your engine's ECM. It actively and safely optimizes calibrations in real-time thanks to its OBD-II connectivity. No competitive tuner does that.

Derringer has 6 levels, adjustable on-the-fly using the iDash. Level 6 produces best-in-class performance. Level 3 is designed for work use and has a great mid-range feel. When running Level 3 with a loaded truck and/or pulling a trailer, your on-ramp merging speeds and passing times are greatly improved.

The electronics are enclosed in a compact housing which is easily concealed and communicates with other Banks devices such as our iDash DataMonster, iDash SuperGauge, and PedalMonster throttle booster. The Derringer connects in line with your truck's engine sensors. But unlike other tuners, it also connects to the vehicle's OBD-II diagnostic bus.

ActiveSafety health monitoring circuitry keeps an eye on the vehicle and the module itself. It checks its health 100 times a second. If it detects an issue, the Derringer instantly bypasses itself, sets a device diagnostic code, and seamlessly returns the truck to stock power. Plus, Derringer's special coolant temp monitoring prevents power addition when the engine is too cold or overheated. The Derringer also auto-adjusts power if knock occurs due to bad fuel. Maximum safe power is all automatic with a Derringer — you just choose your preferred power level and enjoy the ride.

• Adds up to 81 hp and 144 lb-ft
• 6 power levels that can be changed on-the-fly via iDash. Each level adds approx 16 hp
• Simple plug-and-play installation with easy removal for dealer service
• Interfaces with OBD-II Port (On-Board Diagnostics) to communicate with vehicle's ECM
• Warranty friendly: no reflash required and no traces left in ECM
• Works while in cruise-control
• AutoRate tunes in realtime using vehicle diagnostics
• ActiveSafety protects engine/powertrain
• Transcommand protects transmission
• Real-time bar graph on iDash displays Derringer's added power
• Update Derringer firmware, calibration through iDash using microSD card

Results in torque and power gains across the full operating rpm range, starting right off idle and marching to the shift point in each gear. Derringer is dyno calibrated to use multiple data inputs such as throttle position, rpm, vehicle speed, AFR, knock, coolant temperature, and EGT, just like your engine's ECM. It actively and safely optimizes calibrations in real-time thanks to its OBD-II connectivity. No competitive tuner does that.

Derringer has 6 levels, adjustable on-the-fly using the iDash. Level 6 produces best-in-class performance. Level 3 is designed for work use and has a great mid-range feel. When running Level 3 with a loaded truck and/or pulling a trailer, your on-ramp merging speeds and passing times are greatly improved.

The electronics are enclosed in a compact housing which is easily concealed and communicates with other Banks devices such as our iDash DataMonster, iDash SuperGauge, and PedalMonster throttle booster. The Derringer connects in line with your truck's engine sensors. But unlike other tuners, it also connects to the vehicle's OBD-II diagnostic bus.

ActiveSafety health monitoring circuitry keeps an eye on the vehicle and the module itself. It checks its health 100 times a second. If it detects an issue, the Derringer instantly bypasses itself, sets a device diagnostic code, and seamlessly returns the truck to stock power. Plus, Derringer's special coolant temp monitoring prevents power addition when the engine is too cold or overheated. The Derringer also auto-adjusts power if knock occurs due to bad fuel. Maximum safe power is all automatic with a Derringer — you just choose your preferred power level and enjoy the ride.

• Adds up to 81 hp and 144 lb-ft
• 6 power levels that can be changed on-the-fly via iDash. Each level adds approximately 16 horsepower
• Simple plug-and-play installation with easy removal for dealer service
• Interfaces with OBD-II Port (On-Board Diagnostics) to communicate with vehicle's ECM
• Warranty friendly: no reflash required and no traces left in ECM
• Works while in cruise-control
• AutoRate tunes in realtime using vehicle diagnostics
• ActiveSafety protects engine/powertrain
• Transcommand protects transmission
• Real-time bar graph displays Derringer's added power
• iDash displays dozens of temps, pressures, speeds, and info your dashboard doesn't
• iDash displays 5 customizable pages of 2-8 gauges per page
• DPF regen status, DEF level, displayed
• iDash logs up to 100 parameters at 20hz.
• Supplied SD card stores hundreds of hours of datalogs
• Data logs can be viewed right on the iDash or transferred to a computer for analysis 
• iDash logs up to 20 min/max values with customizable alerts
• Update Derringer firmware, calibration through iDash using microSD card

Stay safer, see further, and brighten your nighttime driving experience with Fleece Performance All Lights On™. The All Lights On allows your high beams, low beams, and fog lamps to all be on simultaneously to illuminate the roadway when your high beams are activated. When your high beams are not on, your low beams and fog lamps will operate normally.

The All Lights On module installs in less than 10 minutes and will fit the following range of vehicles equipped with factory installed fog lights:

• 2015 - 2019 Chevrolet Colorado and GMC Canyon
• 2007.5 - 2020 Chevrolet Silverado & GMC Sierra 1500/2500HD/3500HD
• 2007 - 2019 Chevrolet Tahoe & Suburban
• 2007 - 2019 GMC Yukon & Yukon XL
• 2007-2013 Chevrolet Avalanche
• 2007-2014 Cadillac Escalade

Fits as stock replacement or leveled and lifted applications where an upgrade is desired to provide better performance, style, and function.

The boxed sheet metal arms are welded and powder coated semi-gloss black. Pre-installed maintenance free ball joints are included as well as new crush sleeves and polyurethane bushings.

These arms feature corrected ball joint angle for lifted and leveled applications. The allowable droop travel is also improved with the design of these arms. Ample droop travel is required for good ride quality and all suspension components to last and work properly.

Each Kit Features:

*Supersedes 110-90761*

Increase fuel filter capacity and amount of time between filter changes on your 2017+ 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 stock cartridge filter base using the same OEM style quick disconnect fuel line fittings.

• Ensures maximum effectiveness in cold weather by keeping the fuel flow path across the PTC heating element
• Gray anodized finish with engraved WCFab Logo
• Compatible with stock trucks, No tuning required
• Includes Donaldson 4 micron fuel filter and water separator (Donaldson P/N P553203), filter base with integral mounting, distribution filter block/filter coupler, quick disconnect fittings, and 1/8" NPT port for fuel pressure monitoring
• Replaces GM Part #23149526 and #84711317

The MultiPro Tow & Stow has been designed specifically to work with GM's MultiPro tailgate. Just lock it in your receiver, stow the ball assembly underneath, and you're free to use the inner-gate and step feature of your MultiPro tailgate.

• Wide top for maximum strength
• Machined cutout for needed tailgate clearance
• Narrow bottom for adjustability
• Offset swingarm allows for optimum towing position 
• GVW 10,000
• VTW 1,000

The MultiPro Tow & Stow has been designed specifically to work with GM's MultiPro tailgate. Just lock it in your receiver, stow the ball assembly underneath, and you're free to use the inner-gate and step feature of your MultiPro tailgate.

• GVW 14,500
• VTW 1,450

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 anodized finish with engraved Wehrli Custom Fabrication logo.

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. Not compatible with OEM L5P in-tank pump or high pressure lift pumps designed for use with HP4 injection pumps.***

Which CP3 pump size option is best for you?

Sportman (WCF100455)- A great choice for trucks looking to replace a failed HP4, or applications with stock injectors or Exergy 30% over modified units being used with stock or drop in VGT charger setups or our S364.5 or S369 Drop in Fixed Vane Turbo Kits. With proper tuning this pump will support equivalent power levels to the HP4, up to 750 HP to the wheels. 

10mm (WCF100456)-  This pump pairs well with our S372, S463, and S467.7 kits with Exergy 60 or 100% over injectors targeting power levels up to 850 HP to the wheels.

12mm (WCF100457)-  Works best with our S472 and S476 kits with Exergy 100% over injectors and has been proven to reliably support over 1000 WHP in our regular cab shop truck.

14mm (WCF100458)- Ideal for built competition engines using power adders, big single or custom compound chargers with custom injectors looking to push the limits of the L5P platform.

NOTE: CUSTOM TUNING IS REQUIRED. This is a Racing Product for Competition use only. 

The WCFab Splash Shield Kit for 2020-2021 Chevrolet Silverado 2500/3500 HD and GMC Sierra/Denali 2500/3500 HD trucks replaces the easily damaged factory plastic part covering the lower engine bay and cooling stack. Our heavy gauge aluminum splash shield kit provides added strength, coverage, and protection to the underside of your truck and a clean appearance. Includes high quality flanged hardware. Installs easily using factory mounting points. Made in USA. Finished in your choice of Fine Texture Black powder coat to match OEM plastics or your choice of custom colors (additional cost and lead time applies).

***Confirmed fitment with stock height and leveled trucks. If your truck has a suspension lift, please call / email before ordering to confirm compatibility with your aftermarket suspension components.***

***Not a skid plate. This aluminum lower front cover provides superior protection compared with the factory plastic part, but is not designed to withstand heavy impacts with trail obstacles and off road hazards.***

WE STRONGLY RECOMMEND using the WCFab open flange style intake horn with this turbo (2017-19 Year WCF100332; 2020-21 Year WCF100326). Our standard horn with MAP ring will suffice but the turbo is more efficient and produces more horsepower with the open style flange VS MAP ring flange when tested back to back on the dyno. This high flow intake horn (shown in the drop down options) paired with our High Flow Air Intake Kit will Maximize Performance, EGT Control, and Spool up.

WE STRONGLY ADVISE AGAINST using the OEM intake horn with this turbo! The OEM horn Limits air flow by ~30% verses the high flow horn and the turbo will not perform at its maximum potential. 

Stealth 67G2 VGT - L5P 800 rear wheel horsepower capable the Stealth 67G2 VGT is an easy to install upgrade that spools up quickly, controls EGT's under heavy load, allows to turbine braking during towing scenarios, and kicks ass when leaned on. Building this line of Stealth's meant designing a turbo that would be safe to tow with, fun to drive every day and perform at competitions. If you think street-able, clean, stock-appearing power is cool then this is the turbo for you!

Package includes:

• 800RWHP verified with upgraded fuel system
• Fits 2017+ Duramax L5P
• 100% Stock Appearing
  • Completely bolt-on (fits just like your factory turbocharger)
• Custom Nozzle Ring Assembly (Vane Cage and Vanes) create the fastest spooling and highest flowing drop-in style variable geometry turbocharger available
  • Low drive pressures at high load
  • Improved efficiencies vs. stock to help with better EGT control
• 10 blade turbine wheel produces distinctive throaty howl exhaust sound
• Custom Billet 67mm Compressor Wheel. 11-blade design provides a wide efficiency range allowing users to tow without risk of surge.
• 81 lbs/min of Air Flow vs 60 lbs/min stock
• New Assembly - NO CORE CHARGE
• Fully Functional Exhaust Brake
• Quick Spool-Up = Useable Horsepower
• Wide Torque Curve
• Great for Towing and Fun to Drive
• 12 month Warranty

The L5P Stealth 67G2 features the largest turbine and vanes available in this frame. Increasing turbine size dramatically reduces drive pressure under heavy load, helping you achieve nearly a 1:1 drive to boost ratio under most operating conditions. Controlling drive pressure helps make more power and significantly lowers EGT's.

It's a proven fact that OEM head bolts are the weak link in a diesel engine; especially if that engine has been modified for increased performance levels beyond OEM specifications. That's because Duramax, Cummins, and Power Stroke engines are all assembled using 'Torque To Yield' (TTY) bolts and preloaded to yield and beyond (typically 100-110%). Any increases in combustion pressure can lead to problems like blown head gaskets or catastrophic engine failure. And because TTY bolts are yielded by design, they should never be re-used.

ARP solves the problem by offering stronger head studs that are designed for higher clamping loads. 

This set of ARP-2000 Pro Series cylinder head studs are cold-forged to ensure molecular integrity and are best suited to mild performance builds on L5P Duramax 6.6L engines manufactured from 2017-2020. ARP studs are heat-treated prior to thread rolling and machining to provide optimum fatigue strength. 12-point nuts and hardened parallel washers included for even load distribution and accurate torque readings.