2017-2023 Duramax L5P Dirty 3.5" Downpipe (L5P-EXH-A004)

Elevate your L5P’s performance and ditch the bottleneck. The factory L5P downpipe is notoriously restrictive, featuring a "crushed" profile that robs your engine of power and sends EGTs through the roof. The Dirty 3.5" Downpipe is the solution, engineered to provide a smooth, high-flow exhaust path directly from the turbo outlet.

Constructed from full T304 stainless steel, this downpipe is built to handle the intense heat and vibration of a hard-working diesel. It features a precision 4-bolt flange that mates perfectly with the factory turbo and works seamlessly with either the OEM exhaust or any aftermarket race system. To ensure your engine bay stays protected, every kit includes a high-quality heat wrap to keep temperatures under control.