GM/Chevy 3.5" Downpipe L5P Duramax | 2017-2023

The 3.5" Turbocharger Downpipe for the 2017–2023 L5P Duramax removes the DOC (Diesel Oxidation Catalyst) and increases exhaust flow straight out of the turbo, improving performance. Also called the turbo direct pipe, it fits the Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax L5P — pickup trucks only.

Here's how it differs from a standard delete pipe. Both DPF delete pipes and full exhaust systems start behind the Diesel Oxidation Catalyst, leaving it installed for emissions-on setups. This pipe starts at the turbocharger and fully removes the DOC for the best airflow and power gains. It's the piece you need to fully strip the emissions system, but it isn't required for a delete tune to function.

The pipe is 3.5" stainless steel and flows 20% better than the factory pipe. It comes with heat wrap to keep engine bay temperatures down and improve heat retention, and it mounts with a 4-bolt flange that ships with two studs already installed. It completely eliminates the DOC and is built for maximum flow in competition applications — and on its own, it won't affect your emissions systems.

This fits the 2017, 2018, 2019, 2020, 2021, 2022, and 2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD with the 6.6L Duramax L5P. Orders process within 1 business day with 4–8 business day standard shipping, and the kit carries a 30-day return policy while unused — once installed, returns aren't accepted.

For off-road/competition use only.