Wehrli 100648 2 inch Stainless Passenger Up Pipe with Gaskets (Twin Turbo Only) | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Features:

• Fits 2001–2004 GM 6.6L Duramax LB7
• For Silverado and Sierra 2500HD/3500HD
• Designed for twin turbo setups only
• Constructed from 11-gauge stainless steel
• Includes heavy-duty stainless steel bellows
• Reduces exhaust leaks compared to OEM pipe
• Improves turbo spool-up and throttle response
• Helps lower exhaust gas temperatures (EGTs)
• Smooth bends designed for better exhaust flow
• Includes new gaskets for easy installation
• Compatible with factory exhaust manifold

Built for Boosted Performance in Twin Turbo Setups

If you're running a twin turbo system on your 2001 to 2004 GM Silverado or Sierra 2500HD/3500HD with the 6.6L Duramax LB7, the Wehrli 100648 2-Inch Stainless Passenger Up Pipe is a must-have upgrade. The factory passenger-side up pipe is known for being lightweight and prone to cracking and leaking, especially under higher boost and heat. Wehrli’s version solves that problem with a heavy-duty 11-gauge stainless steel design, paired with reinforced stainless bellows that can handle the thermal expansion and vibration of a high-performance build. This isn’t just about durability—it’s also about flow. With smoother bends and a larger 2-inch diameter, this pipe promotes quicker turbo spool-up and helps lower exhaust gas temperatures.

Twin Turbo Fitment with Factory Compatibility

Designed specifically for use in twin turbo applications, this up pipe routes more cleanly than stock by avoiding the sharp, restrictive angles found in the OEM design. It’s built for flow and function, but still works with the factory exhaust manifold, making it a straightforward swap for builders looking to maximize efficiency. It’s important to note that this pipe is not compatible with conventional downpipes behind the engine due to its routing, so it’s intended strictly for properly configured twin setups. Each pipe comes complete with high-quality gaskets, so you have everything you need right out of the box. For Duramax owners chasing more power with fewer headaches, this is the kind of part that gets the job done right.

Fits: 2001, 2002, 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7