WEHRLI WCF100570 2001-2004 LB7 DURAMAX S400/STOCK TWIN (COMPOUND) TURBO KIT

2001-2004 LB7 Duramax S400/Stock Compound Turbo Kit. 1000 RWHP capable depending upon turbo and fuel system modifications. Recommended for daily driver work trucks and tow rigs looking for increased horsepower, better fuel mileage, and superior EGT control with stock-like turbo spool characteristics.

Recommended Combinations:

S475 / Stock IHI Turbo - Up to 750 RWHP with Supporting Modifications - Best Turbo Spool, performs well on stock fuel setups. WCFab 750 Built Allison transmission recommended.

S480 / Stock IHI Turbo - 800+ RWHP Capable with Supporting Modifications - Better top end performance that sacrifices a bit of spool on the low end compared to an S475/stock setup. WCFab 750+ Built Allison transmission recommended.

S480 / Stealth 64 Drop In Turbo - 900+ RWHP Capable with Supporting Modifications - Improved top end power with moderate spool characteristics. WCFab 750+ Built Allison transmission recommended.

Don't see what you're looking for here? Check out our S400/S300 or S400/S400 kits for ultra high performance applications or give our specialists a call at 630-277-8239 for assistance custom building a setup that will work best for your needs.

***This kit requires removal / relocation of the passenger side battery.***

- 5" Intake
- Dry Air Filter
- Outerwears Pre-Filter cover
- 3.5" Cold Side Charge Pipe
- 3.5" Turbo Inlet Horn
- 3" One Piece Y-bridge with HD Bead roll end
- 3" Cold Side Intercooler Pipe
- 14g Aluminum Construction
- Powder Coating
- Silicone Boots
- T-Bolt Clamps
- V-Band Clamps
- 3" Steel Turbo Hot Side Cross Over Pipe
- 4" Steel Turbo Down Pipe
- Heat Wrap & Clamps
- High Temp Black Ceramic Coating on Hot Side Pipes
- Atmosphere Turbo Pedestal with Built in Oil Return Fitting
- Coolant Overflow Tank with Hoses, Fittings, & Low Coolant Sensor
- Stainless steel oil feed and drain lines with fittings

The WEHRLI WCF100570 2001-2004 LB7 Duramax S400/Stock Twin (Compound) Turbo Kit is a powerful upgrade designed to unleash the full potential of your 2001-2004 LB7 Duramax engine. With the capability of reaching up to 1000 RWHP depending on turbo and fuel system modifications, this kit is ideal for daily drivers, work trucks, and tow rigs seeking increased horsepower, improved fuel efficiency, and superior exhaust gas temperature (EGT) control while maintaining stock-like turbo spool characteristics.

The kit offers several recommended combinations to suit your performance needs. The S475 paired with the Stock IHI Turbo can achieve up to 750 RWHP with supporting modifications, providing excellent turbo spool and performance on stock fuel setups. For even more power, the S480 with the Stock IHI Turbo reaches 800+ RWHP with enhanced top-end performance, sacrificing some spool on the low end compared to the S475/stock setup. Furthermore, the S480 with the Stealth 64 Drop-in Turbo can deliver 900+ RWHP with improved top-end power and moderate spool characteristics.

If you're looking for even higher performance, our specialists can assist you in customizing an S400/S300 or S400/S400 kit based on your specific requirements. Additionally, the kit requires the removal or relocation of the passenger side battery to accommodate the turbo setup.

Enhance the durability and visual appeal of your kit with our powder coating service. Our state-of-the-art facilities offer a wide range of colors to choose from, with options for single-coat and two-coat finishes available. Powder coating provides long-lasting protection against corrosion, ensuring that your components not only look great but also remain resilient over time. Trust Wehrli Custom Powder Coating for exceptional quality control, preparation, and packaging to meet your customization needs.