Only fits in conjunction with Capristo Exhaust System. These lightweight pipes fit in place of the heavy OEM Silencer. Using test pipes removes the flow restriction placed on an exhaust system. The silencing effect is removed, enhancing the aggressive engine sound. Made from T309 (1.4828) stainless steel. This System fits BOTH the V6 and V8 Models of the B8 chassis. Designed to be installed directly into existing OEM mounting points. Manually TIG-welded and hand-polished at our Sundern, Germany factory. These mid-silencer spare pipes are compatible with Audi S4, S5, RS4, and RS5 (B8 chassis) models. IMPORTANT: Recommended For Off-Road and Track Use Only