15.5-16 Duramax 4″ Downpipe Back Delete Exhaust No Muffler

15.5-16 Duramax 4″ Downpipe Back Exhaust by P1 Race Parts Competition Exhaust Systems are an ideal solution to pair with a race tuner and delete your diesel particulate filter (DPF) off your diesel pickup truck. You must use a tuner when removing the DPF off of the vehicle.

Before Ordering This:

Halfway through 2015, GMC made a production change in the connection between the catalytic converter and the turbo direct pipe on the LML. Please ensure you have the late LML 3-bolt style flange before ordering the kits listed on this page. 

This pipe is the 3 Bolt Flange. If you have the V Band Style please order the 11-16 pipe. You can see which type of flange you have by looking at the downpipe through the passenger wheel well.