Chevrolet Silverado Twin Turbo Kit - Wehrli - S400/Stock - Illusion Blueberry - 01-04. Built for 2001-2004 Duramax LB7 trucks, this compound kit pairs an S400 atmosphere turbo with the stock IHI for strong power and stock-like drivability.

Ideal for daily-driven work trucks and tow rigs seeking more horsepower, improved fuel mileage, and tight EGT control. Suggested setups: S475/stock to ~750 RWHP, S480/stock 800+, S480/64mm 900+ (all with supporting mods; WCFab 750/750+ built Allison recommended). Not compatible with Banks intercoolers—contact us if running a Banks charge air cooler (additional parts/lead time). Requires removal/relocation of the passenger-side battery. Hot/driver-side intercooler pipe sold separately (WCF100349). Turbochargers not included.

Features

• 3" one-piece Y-bridge (HD bead roll)
• 4" ceramic-coated downpipe
• 5" intake, dry filter with Outerwears pre-filter
• 3.5" cold-side charge pipe and 3" cold-side intercooler pipe
• 3.5" turbo inlet horn
• Coolant tank with hoses, fittings, low-coolant sensor
• Stainless oil feed/drain, silicone boots, T-bolt/V-band clamps, heat wrap
• Atmosphere turbo pedestal with built-in oil return; Illusion Blueberry powder coat; Made in USA

Questions or parts planning help? Call our Austin shop at 512-982-9393 (TX) or our Los Angeles area shop at 562-981-6800 (CA). We offer installation and customization services at both locations.

If you are considering multiple items, please contact us for possible shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov