AWE Tuning B8/B8.5 Audi S4 Track Edition Cat-Back Exhaust System, available with Chrome Silver or Diamond Black Tips in 90mm or 102mm variety.
This system replaces the restrictive factory exhaust system from behind the catalytic converters all the way back to quad exhaust tips.
Boasting a free-flowing design over the OEM exhaust unit, this is the loudest option built for those who get pleasure from waking the neighbors in the early morning.