aFe LARGE Bore HD Exhausts Cat-Back SS-409 EXH CB Ford Diesel Trucks 03-07 V8-6.0L (td)The Large Bore HD Performance Cat Back exhaust features 4" 409 stainless steel tubing with smooth curves and increased size to help remove restriction and keeps exhaust gasses flowing smoothly. The OE style band clamps and bayonet style hangers make sure this system installs cleanly and easily. You will see increased performance and lower EGTs from this system. This system does not come with a tip. This Part Fits: Year Make Model Submodel 2004 2007