SRS performance cat-back exhaust systems are made out of T304 stainless steel, CNC machined flanges and are mandrel bent for superior performance. Complete with a chrome polished finish for the best possible looks. All of our performance exhaust systems are guaranteed to have a smooth, deep tone with a throaty clean sound. SRS performance cat-back exhaust systems have 2.5" piping and a 4.5" tip for most models. There is no welding required, and a good fitting is guaranteed with an easy, direct bolt-on installation.