Wehrli 17-24 Chevrolet 6.6L L5P Duramax 2in Stainless Up Pipe Kit w/Gaskets

If you're working on a 2017-2025 Chevrolet Silverado 2500 HD or 3500 HD, or a GMC Sierra 2500 HD or 3500 HD with the 6.6L L5P Duramax engine, this up pipe kit from Wehrli Custom Fabrication is a solid upgrade over the stock components. The factory up pipes are known to be a weak point, often cracking and causing exhaust leaks that can hurt performance. This kit replaces those with much more robust stainless steel pieces designed to handle the demands of your truck.

Wehrli uses 11-gauge stainless steel for these up pipes, which is considerably thicker than the factory 16-gauge material. The larger 2-inch diameter pipes, compared to the stock 1 5/8-inch, allow for better exhaust flow, which can lead to improved turbo spool-up and a reduction in Exhaust Gas Temperatures (EGTs). This means your turbo can get to work faster and run a bit cooler. The kit also features heavy-duty stainless steel bellows that are much less prone to cracking than the OEM ones. It's designed to work with your factory exhaust manifolds, and installation is a straightforward bolt-on process with no tuning required. The kit comes complete with all the necessary gaskets to get the job done right.

This kit is a direct replacement for several GM part numbers, including 12688021 and 12702943, and is also fully compatible with Wehrli's own billet exhaust manifolds if you're planning further upgrades down the line. It's a great way to address a common failure point and potentially gain some efficiency from your Duramax engine.