Wehrli Custom Fabrication WCF100570-CR LB7 Duramax S400/Stock Twin Turbo Kit Candy Red

The Wehrli Custom Fabrication WCF100570-CR is a complete S400/Stock compound twin turbo kit engineered specifically for 2001-2004 LB7 Duramax engines. This comprehensive turbo system is capable of supporting up to 1000 RWHP depending on turbo selection and fuel system modifications, making it an ideal upgrade for daily drivers, work trucks, and tow rigs seeking increased horsepower, improved fuel economy, and superior exhaust gas temperature control while maintaining stock-like turbo spool characteristics.

Key Features:

• Atmosphere turbo pedestal with built-in oil return fitting
• 5-inch intake system with dry air filter and Outerwears pre-filter cover
• 3.5-inch cold side charge pipe and turbo inlet horn
• 3-inch one-piece Y-bridge with heavy-duty bead roll end
• 3-inch cold side intercooler pipe constructed from 14-gauge aluminum
• 4-inch steel turbo downpipe with high-temp black ceramic coating
• 3-inch steel turbo hot side crossover pipe with heat wrap and clamps
• Coolant overflow tank with hoses, fittings, and low coolant sensor
• Stainless steel oil feed and drain lines with fittings
• Complete hardware including silicone boots, T-bolt clamps, and V-band clamps
• Custom Candy Red powder coating for a premium finish

Performance Options: The kit accommodates multiple turbo combinations including S475/Stock IHI (up to 750 RWHP), S480/Stock IHI (800+ RWHP), or S480/Stealth 64 drop-in (900+ RWHP) configurations. Compounding over the factory turbocharger provides cooler EGTs and increased power across the entire RPM range while preserving the factory turbine brake feature. Note that this kit requires removal or relocation of the passenger side battery and is not CARB legal for California.