AWE Exhaust Fitment Kit for Audi R8 S Tronic (Required With Exhaust For S Tronic Cars)NOTE: Customers with S Tronic cars must also purchase the Audi R8 S Tronic Exhaust Fitment Kit One of the most meticulously engineered systems in the AWE Tuning catalog designed for perfection at every level. H Pipe Crossover for enhanced tone and exhaust scavenging AWE Tuning Bullet Style mufflers Max gains: +21 hp and +50 ft lb at the crank 34 lb weight savings over stock Crafted from T304 stainless steel Designed and manufactured in house at AWE