Downpipe Back

Downpipe Back Exhaust Parts for Duramax & Cummins

On a diesel truck, the downpipe and the tailpipe bookend the exhaust. A larger turbo downpipe lowers back pressure right at the turbo outlet, helping spool and keeping exhaust gas temperatures in check when towing, while a stainless tailpipe replaces a rusted or restrictive factory section at the rear of the system.

This collection holds MagnaFlow diesel exhaust parts: 3 inch and 4 inch turbo downpipes for the GM 6.6L Duramax from 2001 to 2007, and stainless steel tailpipes for the Dodge Ram Cummins from 2003 to 2007. They are individual sections rather than complete downpipe back systems, which makes them a good fit when you are replacing one damaged piece or building your system in stages.

We are an authorized MagnaFlow dealer, and every part is genuine with full manufacturer warranty coverage. Tell us your truck's year, cab and bed length and we will help confirm fitment.