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

If you're looking to upgrade your 2001-2004 Chevrolet Silverado 2500 HD or 3500 with the 6.6L LB7 Duramax engine to a larger Borg Warner S400-style turbo, this install kit from Wehrli is what you need. It's designed to replace your stock IHI turbo setup and open up the airflow path for significant power and efficiency gains. This kit includes all the necessary plumbing, intake, and supporting components to make the swap, but remember, the turbocharger itself is sold separately.

Wehrli has put together a comprehensive package here. You get a new 5-inch fabricated aluminum intake system with a heavy-duty sheet metal air box and a high-performance dry filter, complete with a pre-filter cover. The intercooler piping is upgraded to 3-inch diameter, mandrel-bent aluminum tubes for better flow on both the hot and cold sides. A key component is the upgraded 3-inch fabricated billet Y-bridge, which replaces the restrictive stock part to ensure maximum airflow into the engine. For oil supply, the kit uses high-quality stainless steel braided Parker lines, with the feed line routing directly from the engine block's main oil galley. The kit also includes a T4 fabricated steel pedestal and spacer, along with hardware, 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 V-band clamp, meaning no cutting or modifications are needed for your exhaust system. A driver's side transmission dipstick tube is also included to make installing the downpipe easier.

This kit is made in the USA and features a custom powder coat finish. It comes with all the necessary silicone boots, stainless steel T-bolt clamps, V-band clamps, and heat wrap to complete the installation. If you're not purchasing a Borg Warner turbo directly from Wehrli, be sure to provide the details of your chosen turbo so they can ensure proper fitment for your kit.