Wehrli 01-04.5 Chevrolet 6.6L LB7 Duramax S400 Turbo Install Kit (No Turbo) - Bengal Blue

If you're looking to swap your stock turbo for a larger Borg Warner S400 frame turbo on your 2001-2004 Chevrolet Silverado 2500 HD or 3500 with the 6.6L LB7 Duramax engine, this install kit from Wehrli Custom Fabrication is what you need. It's designed to make that transition smoother, giving you the foundation for significant horsepower and efficiency gains. This kit focuses on improving the airflow path from the turbocharger into the engine, replacing restrictive factory components with well-built alternatives.

This kit includes a new 5-inch fabricated aluminum intake with a heavy-duty sheet metal air box and a high-performance dry filter, complete with a pre-filter cover. The intercooler hot and cold side plumbing is upgraded to 3-inch diameter, mandrel-bent aluminum tubing for better flow. A key component is the upgraded 3-inch fabricated billet Y-bridge, which replaces the stock upper intake manifold to optimize air delivery to the cylinders. High-quality stainless steel braided oil lines from Parker are included, with the feed line routing directly from the engine block's main oil galley. The kit also features a T4 fabricated steel pedestal and spacer, designed to work with 2-inch high-flow stainless steel up-pipes. The included high-temperature ceramic-coated turbo downpipe connects directly to your existing exhaust system's V-band clamp, meaning no cutting or modifications are needed for your exhaust. A driver's side transmission dipstick tube is also included to make installing the downpipe easier.

This kit comes in a striking Bengal Blue powder coat finish. Please note that this kit does not include the turbocharger itself; that must be sourced separately. If you're not purchasing a Borg Warner turbo from Wehrli, be sure to provide the specific details of your chosen turbo so they can ensure proper fitment. Lead times begin once Wehrli has your turbo in possession for mock-up. This kit is not CARB approved and cannot be shipped to California.