PS, the stock audi sports exhaust actually has a sound chamber inside the backbox on the left hand side, this sound chamber amplifies the sound and acts like a mechanical speaker. Audi went through over 50 different systems when designing the exhaust for the RS3, and they haven't disappointed.
My friends with straight piped RS3 8P and TTRS 8J are astounded on how loud my car actually is as its louder than theirs with the added benefit of zero drone even with all cats removed, and then how quiet it can become when placed into comfort mode.