4" CAT & DPF Test Pipe
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 any of the kits listed on this page.
If you have the newer 4-bolt flange instead, please refer to our 2017+ L5P Exhaust Systems.
Fits: 2015.5-2016 2500/3500 Extra Cab & Crew Cab (Short Bed, Long Bed, Dually)
There may be additional lead time, Please contact us if you require it my a certain date prior to ordering