Integrated Engineering Catback Exhaust System | B9 A4 | 2.0L Turbo I4 MK4 Jetta (1J) 2.0L I4 Our center Helmholtz resonator cuts

Our center Helmholtz resonator cuts through drone so you only hear the sounds that are pleasing to the ear

For GTI models with locked TCUs

resulting a firmer feel when shifting

oxygen-rich air increases power output by 21 horsepower

Integrated Engineering Catback Exhaust System | B9 A4 | 2.0L Turbo I4 MK4 Jetta (1J) 2.0L I4 Our center Helmholtz resonator cutsGiven 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