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Wehrli Custom Fab twin turbo kit for 2001–2004 Duramax LB7 trucks is a compound S400/stock setup built for high output and daily-driven use. The kit lists components such as intercooler piping, stainless oil feed and drain lines, clamps, a coolant overflow tank with sensors, and a finished powder-coated assembly. It’s offered as a complete hardware package aimed at increasing horsepower and improving charge-air control when combined with supporting fuel and transmission upgrades.
Wehrli 01-04 Duramax LB7 Twin Turbo Kit S400/Stock - Gun Metal
