Integrated Engineering Catback Exhaust SystemGiven the nature of the Audi A4 4 cylinder 2. 0T, iE engineers had to do a little bit more voice coaching to bring out all the roars and rumbles in all the right places. It wasnt an easy ask, but the end result is a thing of beauty. We replaced that underwhelming stock sound with a more muscular tone and none of the rasp found on downpipe only setups. Meticulously manufactured with reinforced piping, boxed hangers, high flow pipe design, and finely