Chevrolet Silverado 2500 HD Turbo Swap Kit - Wehrli - S400 - Flat Black - 01–04. Designed for 2001–2004 LB7 Duramax trucks, this kit converts your stock IHI setup to an S400-frame single turbo foundation.

Built by Wehrli Custom Fab, it upgrades airflow end-to-end: a 5-inch fabricated aluminum intake with sheet-metal air box and premium dry filter feeds high-flow 3-inch mandrel-bent 14-gauge hot/cold charge pipes, while a 3-inch fabricated high-flow billet Y-bridge replaces the restrictive factory upper manifold. Stainless braided Parker oil lines handle feed and drain, a T4 steel pedestal accepts popular S400 units (turbo sold separately), and the high-temp ceramic-coated downpipe mates to the factory front pipe via V-band—no cutting required. Forward-facing thermostat housing (WCF100405) required for LB7 clearance.

Features

• Fits 2001–2004 6.6L LB7 Duramax (2500/3500 HD)
• 5" intake with fabricated air box and pre-filter cover
• 3" hot/cold piping and 3" fabricated billet Y-bridge
• T4 pedestal; downpipe for Half Marmon S400 4.6" flange (not HX40)
• Stainless oil lines; boots and T-bolt/V-band clamps included

Questions on turbo sizing or fitment? If not purchasing a genuine BorgWarner from us, please provide turbo brand/specs; mock-up shipment may be required and lead time begins when your turbo is received. Call our team or visit for installation and customization at our Austin, Texas and Los Angeles, California locations: 512-982-9393 (TX), 562-981-6800 (CA).

If you are considering 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