Wehrli 01-04 Duramax LB7 S400 Single Turbo Install Kit - Bronze Chrome

If you're looking to significantly upgrade the airflow and power potential of your 2001-2004 Duramax LB7, this single turbo install kit from Wehrli Custom Fabrication is designed to help you swap your stock turbo for a larger frame Borg Warner S400 style unit. This kit addresses the key components needed to make that transition, aiming to improve horsepower and overall engine efficiency by optimizing the air intake and exhaust path.

Wehrli has put together a comprehensive package here. It starts with an updated air intake system, featuring a 5-inch fabricated aluminum intake with a heavy-duty sheet metal air box and a high-performance dry filter that comes with a pre-filter cover. The hot and cold side intercooler piping is also upgraded to 3-inch diameter, mandrel-bent aluminum tubes for better flow. A notable inclusion is the 3-inch fabricated billet Y-bridge, which replaces the restrictive stock upper intake manifold, ensuring a clear path for air into the engine. The oil feed and drain lines are made from high-quality stainless steel braided Parker lines, with the feed line routing directly from the engine block's main oil galley. The kit includes a T4 fabricated steel pedestal and spacer to mount your chosen turbo (sold separately), and it's designed to work with 2-inch high-flow stainless steel up-pipes. The downpipe is ceramic coated for high temperatures and connects to your existing exhaust system with a V-band clamp, meaning no cutting or modifications are needed for your exhaust. To make installation smoother, a driver-side transmission dipstick tube relocation is included.

This kit is finished in a Bronze Chrome powder coat for a unique look. It comes with all the necessary silicone boots, stainless steel T-bolt clamps, V-band clamps, and heat wrap. Please note that if you are not purchasing a Borg Warner turbo directly from Wehrli, you will need to provide the brand and details of the turbo you plan to use so they can ensure proper fitment for your kit. The lead time for your order begins once they have the turbo needed to build your kit in their possession.