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The Wehrli Custom Fab twin turbo kit for 2001–2004 Duramax LB7 pairs an S400/stocker compound turbo setup in a semi-gloss black finish and is offered as a comprehensive bolt‑in system. Marketed as capable of up to 1,000 RWHP depending on turbo and fuel upgrades, the kit includes charge piping, stainless oil lines, coolant overflow tank, clamps, air filter, intercooler piping and hardware—packaged for heavy-duty towing and high‑power Duramax builds.
Wehrli 01-04 Duramax LB7 Twin Turbo Kit S400/Stock - Semi-Gloss Black
