Flo Pro 2017-2019 Duramax 2500/3500 6.6L, 4″ Downpipe Back Single, Race Exhaust, w/ OEM 4-BOLT Flange EC-CC/SB-LB-Dually Pickup ONLY! – FLO SS880
* IMPORTANT NOTE: These kits will only fit models equipped with the OEM style 4-bolt flange off the turbo direct pipe! If you have a 3-bolt flange, please see our 2015.5 Duramax Exhaust Kits.
In 2017, GMC made a production change in the connection between the catalytic converter and the turbo direct pipe on the L5P. Please ensure you have the newest 4-bolt style flange before ordering any of the kits.