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Wehrli Custom Fab S400 Single Turbo LB7 Duramax Install Kit (2001-2004)

Fits: 2001-2004 GM/Duramax LB7

This Product cannot ship to the state of California
Pricing: $2,569.53

Customize Your Item

- Choose Year of Vehicle -
 * required
- Select Turbo 400 Series -
 * required
- Choose Basic Color* -
- Choose Two Coat Colors $75* -
- Color match comprsr cover S400* -
 * required
- Select Intercooler Brand -
 * required
- Select Up Pipes* -
 * required
- Coolant Pipe Core Charge $150.00 -
 * required
- Upgrade to a 3.5 Inch DownPipe -
 * required


Wehrli Custom Fabrication is an Industry Leader in Duramax Diesel Turbo Kit's and Custom Performance Parts. On the fore-front of turbo kit development they strive in producing the best product on the market. You can rest assured that with the purchase of a Wehrli kit you will receive the best quality product, fitment, customer service, and performance for your truck. With thousands of turbo kits produced at Wehrli in house since 2011, you can be assured that you'll be satisfied with their product.

This kit will allow you to install an S400 based Turbo on your 2001-2004 LB7 Duramax. Replacing all of the OEM plumbing and y-bridge with high flow 3" diameter piping. Oil Lines are high quality stainless steel braided Parker Lines with the oil feed line routing from the main oil galley on the side of the engine block. We designed our down pipe to connect with your exhaust system V-Band and clamp which simplifies installation and does not require you to cut your exhaust system. You can upgrade to the 3 1/2" down pipe but this will require cutting of the exhaust system to install. If you are not purchasing the turbo from us you must specify the brand of turbo you are using, some Turbo's you may be required to ship to use for mock up to build the kit. Each turbo kit is hand built in house by our experienced fabricators and welders. Every part is built and test fit on an engine to ensure proper fitment.
Includes Driver Side Transmission Dipstick Tube That makes installation of the down pipe easier.

Turbo Down pipe is designed for Half Marmon style S400 exhaust outlet; 4.6" Diameter flat flange.

Contents of Kit:
-5" Intake
-Dry Air Filter
-Outerwear's Pre-Filter Cover
-Cast T4 Pedestal & Spacer with Hardware
-Stainless Steel Oil Feed and Drain Lines with Fittings
-3" Fabricated High Flow Y-Bridge
-3" Hot Side Intercooler Pipe
-3" Cold Side Intercooler Pipe
-3" Down Pipe with High Temp Coating (Mates to exhaust system flange)
-Driver Side Trans Dipstick Tube
-Silicone Boots
-T-Bolt Clamps
-V-Band Clamps
-Heat wrap
-Modified Upper Coolant Pipe($150.00 Core)
-Powder Coating

Base Price only, does not include Turbo,Upgrades or Core Charges

Shipping Information

  • Item Requires Shipping
  • 60.0 lbs.
  • W24.0000” x H12.0000” x L36.0000”

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