Integrated Engineering Catback Exhaust System | B9 A4 | 2.0L Turbo I4 MK4 Jetta (1J) 2.0L I4 oxygen-rich air increases power output

oxygen-rich air increases power output by 21 horsepower

5 GTI prior to release

This lower blade count also gives a secondary advantage of removing some material mass

resulting a firmer feel when shifting

The collar is made with ribbed knitting to prevent curling damage

Integrated Engineering Catback Exhaust System | B9 A4 | 2.0L Turbo I4 MK4 Jetta (1J) 2.0L I4 oxygen-rich air increases power outputGiven 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