Pierre,
I have an S3 with a rear Librands Sports Exhaust (quad pipes). I've only had my Aero 6 weeks and spent some considerable time searching for a car with this as part of the configuration. The sound is fantastic (old school grunt) and I love the way the car looks from the rear - proper mean !! With the side exhausts I didn't like the the look of the car from the rear.....a gap where something was missing.
Each to their own......but I'd personally choose rear Librands over side exhausts every time.
