T304 Stainless Steel 4 Inch Resonator Back Single Side Ford 4 Inch Resonator Back Single Side Pro Series Pro Series is the best performance exhaust system that money can buy. It is a series designed and built for the serious enthusiast who will settle for nothing less.Constructed from T304 Stainless Steel it delivers you optimal durability that keeps on looking its best. Easy to clean and maintain this is the product of choice for owners of lifted vehicles, show Trucks or who operate in severe environments.Built to Perform MBRPs performance ex