We recently installed APR's RSC Catback exhaust system on this customer's B8 Audi S4 with the 6-speed manual transmission. This exhaust replaces the factory system's weak sound with a much deeper, authoriatative tone yet actually drones less than the stock setup! For more information on APR's RSC exhaust for your S4 please visit the following link: www.gmpperformance.com
Audi S4, catback exhaust, APR RSC, Exhaust, S4, 3.0T