JEGS headers are engineered utilizing precision formed 16-gauge cold roll and flash controlled steel tubing. We then precisely fit and weld the o-ring port seal 5/16'' flanges and mandrel-formed collectors for the best in performance and economy. Includes all mounting hardware and gaskets. Available in an electro-statically applied black satin painted finish or a silver ceramic coating for beauty and resistance to rust or corrosion. Reducers included where modification(s) to your exhaust system is required. For off-road use only. Made In USA