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. Calibrated Power DT750 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. Calibrated Power DT1000 Built Allison transmission recommended.
S480 / Stealth Mach 1 64 Drop In Turbo - 900+ RWHP Capable with Supporting Modifications - Improved top end power with moderate spool characteristics. Calibrated Power DT1000 Built Allison transmission recommended.
Don't see what you're looking for here? Check out Wehrli's S400/S300 or S400/S400 kits for ultra high performance applications or give Wehrli's specialists a call at for assistance custom building a setup that will work best for your needs.
***This kit requires removal / relocation of the passenger side battery.***
