Downpipe Designed for: Audi RS4 Avant B9 2,9L Audi RS5 F53 / B9 2.9L Audi RS5 Sportback F5A / B9 2.9LDOWNPIPE has a thermal shield. It has a catalyst - 200Closis of the inlet (internal): 72 MMD diameter (internal): 115 mmdnownpipe Turboworks companies are made of 100% stainless steel. & NBSP