Wehrli Fab

Replacement Dry Air Filter used in WCFab 4" Intake kits and S300 Single Install Kits. This Product is to be used for Off-road Race applications ONLY! Cannot Ship to State of California

2011-2016 LML Crew Cab Duramax Fass Mount Bracket to locate pump under truck in front of fuel tank.

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.

Outerwears Air Filter Cover for all WCFab air filters used in our turbo kits and intake kits.

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...

Replacement Dry Air Filter used in WCFab Twin Turbo and S400 Single Install Kits.

2011-2016 LML Duramax Coolant Bypass Kit.Preformed rubber hose routes coolant from thermostat housing to firewall/heater core connection with pre-installed GM quick connect fitting. Billet aluminum anodized plug installs into rear engine cover coolant...

Clean up the engine bay of your 2001-2019 GM 2500/3500 Duramax 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...

The LB7 3" Y-Bridge is an upgraded high flow intake bridge for the 2001-2004.5 LB7 Duramax. The OEM LB7 Y-bridge measure’s only 2 3/8” ID, our fabricated bridge is 3" and we use an HD machined beadroll where the T-bolt clamps so there is no...

Aluminum Upper Coolant Pipe replaces the OEM rubber upper coolant hose and comes powder coated color of choice! For use with OEM GM radiator! Some aftermarket radiators may cause fitment issues!

WCFab 2017-2019 GM L5P 6.6L Duramax 4" Intake Kit with Air Box. This high flow, fabricated aluminum intake pipe and air box enclosure with dry filter assembly replaces the restrictive plastic factory parts on your diesel for improved engine...

3" LB7 Turbo Downpipe for use with OEM charger or Stealth series Drop in. High Temp Coated and Heat Wrap included.

2011-2016 LML Duramax 4" Intake Kit for Factory Turbocharger. This intake works in-conjunction with the factory turbo inlet horn.

Aluminum Upper Coolant Pipe replaces the OEM rubber upper coolant hose and comes powder coated color of choice! For use with OEM GM radiator! Some aftermarket radiators may cause fitment issues!

3 1/2" Turbo Intake Horn for the 2017-2019 L5P Duramax with factory style Turbo. The OEM plastic intake horn is 2.4" diameter and we experienced a 25HP Gain with our 3.5" Horn when used with a Max Effort Tune. Tuning not required, this horn will work...

For use on 2004.5-2016 Duramax VGT Style Turbochargers. 

The 3" High Flow Driver side Intercooler pipe for 2011-2016 LML Duramax replaces the factory two piece 2 ½" pipe with a high flow one piece 3" pipe. It also includes upgraded silicone boots that withstand higher pressure and temperature than the...

2001-2007 LB7/LLY/LBZ Duramax Allison Transfer Case Braces have been developed and tested for use on high horsepower Duramax applications, adding significant strength and reducing driveline flex common to extreme use such as off-roading, pulling, and...

3 1/2" Turbo Intake Horn for 2001-2004 LB7 Duramax with factory style IHI Turbo. Great Upgrade for Factory Charger offering Quicker Spool up!

1 Piece 3" Driver Side Intercooler pipe that was designed to replace the factory pipe and low-quality silicone boots. This Intercooler pipe compliments our S400 over stock twin turbo kit or LB7 Y-Bridge Kits. It is a full 3" intake tract from Turbo to...

LLY, LBZ, LMM Duramas One Piece High Flow 3" Driver Side Intercooler pipe. Replaces the 2 1/2" OEM inter cooler with a full 3" pipe. The OEM Pipe uses a reverse style bead roll design at the turbo which is prone for blowing off of the turbo under higher...

2003-2007 5.9L Cummins High Flow 3.5” Intake Horn and Driver Side Intercooler Pipe Kit. Kit replaces the failure prone 3” plastic OEM intercooler pipe with a 3.5” heavy duty 14g Aluminum intercooler pipe and the OEM cast intake horn...

2001-2004 LB7 Duramax 4" high flow Intake Kit and 3 1/2" Intake Horn for factory turbo.

The only High Flow 3” Complete Y-Bridge kit on the market for your LB7 that is compatible with the factory turbo! Also compatible with S300 or S400 single turbo install kits! Replace the restrictive OEM Y-bridge and cold side intercooler pipe with...

Fabricated Aluminum Rear Differential Cover for AAM 11.5 Axle for Dodge and GM HD Trucks

Replace the restrictive crushed factory down pipe with this full 3" down pipe. High Temp coated for protection. For use with factory turbo or factory style drop in the turbo.

2001-2010 LB7/LLY/LBZ/LMM Duramax Heavy Duty Engine Mounts developed and tested for use on high horsepower application to reduce engine flex in the chassis and broken OEM engine mounts.These high performance Duramax motor mounts have been designed to...

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...

4" Intake Kit for Factory Turbo. 

Fabricated Aluminum Coolant Tank Kit for single turbo applications, mounts in OEM coolant tank location.