Chevrolet Silverado 3500 HD Turbo Swap Kit - Wehrli - S400 - Deore Gold - 01-04. Built for 2001–2004 LB7 Duramax trucks, this WCFab kit converts the stock IHI system to an S400-frame turbo platform with a durable Deore Gold finish.

It upgrades airflow with a 5 in. fabricated aluminum intake, heavy-duty sheet-metal air box, and premium dry filter with pre-filter. High-flow 3 in. 14 ga mandrel-bent hot/cold pipes and a 3 in. fabricated Y-bridge replace restrictive stock pieces. A T4 pedestal with spacer accepts popular S400 options (turbo sold separately), and the high-temp ceramic-coated downpipe mates to your existing V-band front pipe—no cutting required.

Features

• Fits 2001–2004 GM Duramax LB7 2500/3500 HD
• 5 in. intake with fabricated air box and dry filter with pre-filter
• 3 in. 14 ga mandrel-bent hot/cold piping and fabricated high-flow Y-bridge
• Ceramic-coated 3 in. downpipe; connects to existing V-band exhaust
• T4 pedestal and spacer; stainless braided Parker oil feed/drain lines
• Includes silicone boots, T-bolt/V-band clamps, heat wrap, and trans dipstick relocation
• Half Marmon S400 (4.6 in.) outlet; not compatible with HX40
• Forward-facing thermostat housing WCF100405 required; SXE/Race cover kits build-to-order

Questions or planning a build? Call our Austin shop at 512-982-9393 (TX) or our Los Angeles-area shop at 562-981-6800 (CA). Installation and customization services available at both locations.

Ordering multiple items? Contact us for shipping discounts. We install on premises at both locations.

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