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

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 Custom Fabrication is what you need. This kit is designed to transition your truck from its stock IHI turbo to a much larger frame turbocharger, opening the door for significant horsepower and efficiency gains. It includes all the necessary components to make the swap, excluding the turbo itself, allowing you to choose your preferred S400 model.

This kit features 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 plumbing gets a major upgrade with 3-inch diameter mandrel-bent aluminum tubing for both the hot and cold sides, featuring V-band connections for a secure seal. A key component is the upgraded 3-inch fabricated billet Y-bridge, which replaces the restrictive stock part to improve airflow into the engine. High-quality stainless steel braided Parker oil lines are included, 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, designed to work with 2-inch high-flow stainless steel up-pipes. The downpipe is high-temperature ceramic coated and connects directly to your existing exhaust system's front pipe V-band clamp, meaning no cutting or modifications are needed for your exhaust. A driver-side transmission dipstick tube is also included to make installing the downpipe easier.

This kit is finished in a durable gloss black powder coat. While the turbocharger is sold separately, this kit provides a well-built foundation for your custom turbo setup. It's important to note that this kit is not CARB approved and cannot be shipped to California. If you are purchasing a turbocharger separately, please provide the brand and details so Wehrli Custom Fabrication can ensure proper fitment for your kit.