Stock exhaust too quiet? This Large Bore-HD DPF-Back system utilizes 4" tubing and eliminates the factory muffler, significantly improving the sound of the F-150's exhaust system. It's finished off with a large 5" polished exhaust tip. Constructed from mandrel-bent 4" 409 stainless steel for maximum airflow Utilizes factory mounting locations and requires no cutting or modifications to stock parts, making for a quick and easy installation Mild Tone:This system is constructed out of large 4" diameter tubing that is mandrel-bent for maximum air flow, corrosion resistance, and strength. It eliminates the factory muffler, providing smooth sounding performance. Simple Installation:This Large Bore-HD DPF-Back exhaust system utilizes factory mounting locations and OE style bayonet hangers, providing stability and a hassle-free installation. 5" Polished Exhaust Tip:This system includes a polished intercooled clamp-on tip designed to reduce exhaust gas temperatures at the tailpipe. Emissions Disclaimer:This product does not require a CARB EO#