For Subaru Impreza WRX Stainless Steel Catback Exhaust System 5-Door Made of high quality T-304 stainless steel. TIG welded CNC machine flange for resistance against pressure and corrosion. Aggressive deep and smooth tone sound while ensures smooth exhaust gas flow. Increase engine output and efficiency. Muffler Tip Type: Rounded Tip. Tip Diameter (IN): 4.5". Inlet / Outlet Size (IN): 2.25". Silencer Included