Wehrli Custom Fabrication WCF100570-BC S400/Stock Twin Turbo Kit Bronze Chrome

The Wehrli Custom Fabrication S400/Stock Compound Twin Turbo Kit for 2001-2004 LB7 Duramax is one of the most popular upgrades for daily drivers and towing rigs, featuring premium Bronze Chrome two-stage powder coating for exceptional durability and show-quality appearance. This powerful upgrade can achieve up to 1000 RWHP depending on turbo and fuel system modifications, making it ideal for work trucks and tow rigs seeking increased horsepower, improved fuel efficiency, and superior EGT control while maintaining stock-like turbo spool characteristics.

Performance Benefits:

• Compounding over your factory turbocharger provides cooler EGTs and increased power across the RPM range while allowing the use and function of the factory turbine brake feature
• With proper tuning and supporting modifications, the Compound Turbo Kit can provide up to 650 HP and 1300 lbs of torque
• No additional turbo lag or loss of spool up compared to larger single turbo upgrades
• Better response, quick spool up, broader RPM range, increased fuel economy, and more power with better low-end torque, strong mid-range, and superior top-end performance

Kit Includes:

• Atmosphere Turbo Pedestal with built-in oil return fitting
• 3" one-piece Y-bridge with HD bead roll end
• 3" cold side intercooler pipe and 3" turbo hot side crossover pipe
• 4" turbo down pipe
• 5" intake with dry air filter and Outerwears pre-filter cover
• 3½" cold side charge pipe and turbo inlet horn
• Stainless steel oil feed and drain lines with fittings
• Coolant overflow tank with hoses, fittings, and low coolant sensor
• All necessary silicone couplers and hardware

Quality Construction:

• Every WCFab Turbo kit is hand built in-house by experienced fabricators and welders
• Every component is built and test fit on jigs to ensure proper fitment
• All tubing is TIG welded and mating flanges are CNC machined with O-ring seals for a boost-leak free setup
• Lifetime warranty on fabricated components and workmanship to the original owner
• Bronze Chrome two-stage powder coating for superior corrosion resistance and visual appeal

Professional installation is required. Detailed installation instructions are included. Tuning and upgraded fuel system (such as FASS lift pump) are necessary for optimum performance and drivability. Note: Passenger side battery removal or relocation is required to accommodate the turbo setup. This kit does not include the S400 turbocharger—turbo must be purchased separately or specify your turbo brand when ordering. Not legal for sale or use in California.