Invidia Dual N1 GT Cat Back Exhaust Nissan 370Z 2009+Here, you are looking at the Invidia Dual N1 GT Cat Back Exhaust System. The N1 is among one of the most popular cat back exhaust systems available as they make for an excellent upgrade over the OEM exhaust system to improve the performance and the sound. The combination of increased piping diameter along with smooth bends relieves the exhaust with restriction and turbulence under acceleration which will increase the horsepower, the torque, all while