Hi, they call it a catback but its just back and middle sections with the N1, I don't know why some systems are called N1 tbh. Think its the companies 1st version of exhaust for that car. Same as Nismo do the N1 or V1 bodykits up to V3.
There was a few knocking about but don't see many at all these days tbh. They are a bit loud with cabin drone.