J2 Engineering J2CBE037 Dual 4.5" Hi Power Tip Catback Exhaust System for Honda S2000 F20/22 AP1/AP2 Made of high quality T-304 stainless steel with computerized mandrel-bends for strength and durability 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 Dyno proven to instantly increases 15 to 25 horsepower or low end torque