Purchase the AFE 49-42006-P 4" Large Bore HD Filter-Back Exhaust with Polished Tip for your 2007.5-2012 Dodge 6.7L Cummins. The Filter-Back Exhaust with Exhaust Tip is a DPF-back exhaust that is constructed from 4" 409 stainless steel tubing that is mandrel bent and is 100% hand MIG-welded for increased strength and durability. The specially engineered, nonrestrictive design provides your Cummins with 22% more exhaust flow for a better performance and sound. The exhaust system is completed with a 5” intercooled exhaust tip that comes with a sleek black or polished look that reduces EGT’s. Installation is a breeze because the Filter-Back Exhaust uses the factory mounting locations and uses the high quality hardware for a convenient installation.