2017-2026 Duramax L5P 3.5" Downpipe

3.5" Downpipe (2017–2026 Duramax L5P)

This 3.5" downpipe for the 2017–2026 Duramax L5P is built to increase exhaust flow, reduce backpressure, and help lower exhaust gas temperatures (EGTs). It’s a direct-fit upgrade for truck owners who want better spool, stronger pulling power, and improved efficiency—especially under load.

Made from high-quality, high-temp materials, the 3.5" design allows your L5P to breathe better and run cooler. Whether your truck is towing, working, or seeing high-performance use, this downpipe is built to hold up and deliver results.

Includes

• Heat wrap (thermal protection to help reduce under-hood temps)

• Clamps (to keep the wrap secure under extreme conditions)

Features

• High-flow design – reduces restriction for improved turbo response

• Lower EGTs – helps protect the engine under heavy load

• Heavy-duty construction – built to handle high heat and hard use

• Direct bolt-on fitment – fits all 2017–2026 L5P Duramax trucks

Note

Factory exhaust components can restrict performance. This 3.5" downpipe improves airflow and throttle response in a simple, direct-fit upgrade that helps your L5P run cooler and perform better.