Wehrli 01-04 Duramax LB7 S400 Single Turbo Install Kit - Gun Metal

This Wehrli Custom Fabrication kit is what you need to swap your stock turbo for a larger Borg Warner S400-style unit on your 2001-2004 Duramax LB7. You get a complete package designed to make the transition smoother, including a fabricated aluminum intake with a heavy-duty air box and a high-performance dry filter with a pre-filter cover. The kit also updates your intercooler plumbing with 3-inch diameter, mandrel-bent aluminum charge pipes for both the hot and cold sides, and includes an upgraded 3-inch fabricated billet y-bridge to replace the restrictive stock manifold. This setup is aimed at improving airflow into the engine for better horsepower and efficiency.

The kit comes with high-quality stainless steel braided oil lines, including a feed line that routes from the engine block's main oil galley. It features a T4 fabricated steel pedestal and spacer designed to mount popular turbo sizes (sold separately). The included high-temperature ceramic-coated turbo downpipe connects directly to your existing exhaust's V-band clamp, meaning no cutting or modifications are needed for your exhaust system. For easier installation of the downpipe, a driver-side transmission dipstick tube relocation is also included. All the necessary silicone boots, stainless steel T-bolt clamps, V-band clamps, and heat wrap are part of this comprehensive package, all finished in a custom Gun Metal powder coat.