The FLO-835FNB is a CAT & DPF Delete for the 2007.5-2012 6.7L Cummins Trucks. It replaces your restrictive CAT & DPF system with their high-flow 4" mandrel-bent delete kit. It mounts directly to your OE piping without requiring any modifications and includes a FLO-PRO Downpipe. Just like all of Flo-Pro's Exhaust kits, it will come with all the required clamps, pre-weld contour bent hangers, and stronger flanges to help you cruise through the installation process. Since this kit is flanged as factory, it will not match up to an aftermarket exhaust system.