Ok guys im new to the forum im looking for a good aftermarket exhaust system, I have an Audi S4 2014 Red/Black.

 

APR and AWE Tuning are leading the way on the 3.0T engines... You'll probably be happy with either. If you're going to drop some serious money, might as well go all out with some stage 2 tuning/ supercharger pulley upgrade... APR has their own tune, while AWE uses GIAC.