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I know the bloke quotes the system on youtube, but just for my own peace of mind is that the SS back box & Centre section only? Or cat & manifold replaced also.
About 10 years ago a guy I worked with at the time had some performance system fitted to his 325i (old boxy shape) and I'm not joking, on full throttle it sounded like a BTCC car, for such a simple change it really transformed the way the car sounded.