Performance Exhaust Systems are manufactured from 2" inner diameter 16-gauge aluminized steel that lasts up to twice as long as conventional plain steel systems. Made with modern tube benders, utilizing mandrel bends, ensuring each bend is smooth flowing increasing exhaust flow by up to 20% over stock exhaust systems. These Performance Exhaust Systems have bolt-on connectors that adapt to your stock manifold ... no welding necessary! All parts and hardware for standard installation are included. Turbo Exhaust Systems have a 2" in and out Flow Turbo Muffler to reduce back pressure and give that great low exhaust tone you expect from your truck.