Eliminate exhaust leaks and boost exhaust flow on your 2001–2004 Chevrolet 6.6L LB7 Duramax diesel with the Wehrli Custom Fabrication 2-inch Stainless Up Pipe Kit with Gaskets for Single Turbo applications. Wehrli's stainless steel up pipes are precision-fabricated to replace the factory up pipes that are notorious for cracking, warping, and leaking — one of the most common failure points on early Duramax diesel engines.
Wehrli's up pipe kit is constructed from heavy-duty stainless steel for maximum heat resistance and long-term durability. Each pipe is mandrel-bent for a smooth exhaust path and includes new gaskets for a complete, leak-free installation. The 2-inch diameter maintains proper exhaust velocity while reducing restriction compared to failed or corroded OEM units.
Key Features
- Fits: 2001–2004 Chevrolet Silverado 2500HD / 3500HD with 6.6L LB7 Duramax diesel (Single Turbo)
- Complete 2-inch stainless steel up pipe kit — driver and passenger side
- Mandrel-bent stainless steel construction — superior to OEM cast iron pipes
- Includes gaskets for a complete, leak-free installation
- Eliminates common OEM up pipe cracking and exhaust leak issues
- Supports improved exhaust flow and turbo spool on single-turbo LB7 applications
- Made in the USA by Wehrli Custom Fabrication (WCFab)
- EPA Compliant | MPN: WCF100590
One of the most essential maintenance and performance upgrades for any LB7 Duramax owner. The Wehrli stainless up pipe kit solves a chronic OEM weakness and is trusted by diesel mechanics and performance enthusiasts alike for its fit, quality, and longevity.