Has anyone ever fitted an x-pipe and sports cats with standard 4200 rear boxes??
Would it sound similar to if you did the same thing to a GS?
Next week i'm going to fit sports cats and an X-pipe to my GS but will leave the original valved rear boxes, to be honest i never have the car out of sport mode but i think it might be quite loud with the new cats and x-pipe so i will probably take it out of sport for when i'm leaving/returning through my housing estate
If i had a 4200 i'd definitely be replacing the rears if more noise is what you're after