Chevrolet Silverado 2500 HD Turbo Swap Kit - Wehrli - S400 - Chevy Orange - 01-04. For 2001–2004 Duramax LB7, this WCFab kit converts the stock IHI to an S400 single using robust, serviceable components.

The kit advances airflow with a 5 in fabricated aluminum intake, heavy-duty air box, and premium dry filter with pre-filter. High-flow 3 in intercooler tubes and a 3 in fabricated billet Y-bridge reduce restriction. A ceramic-coated 3 in downpipe connects to the existing V-band front pipe (Half Marmon S400, 4.6 in). Stainless braided Parker oil lines and required hardware are included. Turbo sold separately.

Features

• 2001–2004 6.6L Duramax LB7 (2500/3500 HD)
• 5 in intake with fabricated air box and lid
• 3 in hot/cold intercooler piping, 14G aluminum
• 3 in high-flow billet Y-bridge
• Ceramic-coated 3 in downpipe, V-band connection
• Stainless oil feed/drain lines; T4 pedestal
• Chevy Orange powder coat; Made in USA

LB7 requires WCFab forward-facing thermostat housing WCF100405. Downpipe uses the Half Marmon S400 outlet and is not compatible with HX40. SXE/Race-cover kits are made to order; using a non-BorgWarner turbo? Share brand details to confirm fitment. Questions? Call 512-982-9393 (TX) or 562-981-6800 (CA). We have Austin, Texas and Los Angeles, California locations offering installation and customization services.

Thinking about purchasing 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