Audi S4 B9 Non sport Diff models - Non-Resonated (Louder) Cat-Back with Quad Polished Oval Trims Caption Quad Exit GPF Back A plug is integrated into

A plug is integrated into the controller housing for mating to the redesigned wiring harness’s positive-lock connector

These filters are direct replacements for the OEM air filter in your car

Requires Stage 2 ECU Remap

while also improving gas flow

Audi S4 B9 Non sport Diff models - Non-Resonated (Louder) Cat-Back with Quad Polished Oval Trims Caption Quad Exit GPF Back A plug is integrated intoOur range of Cat Back systems are perfectly suited to cater for anyone looking to improve their sound and aesthetics, designed as a direct replacement for the original system, available in multiple configurations enabling the owner to choose the increase in volume of their exhaust and or add a more suitably aggressive tone. All our products are made from 304L Aircraft Grade stainless steel. This quality material will ensure that your Cat Back system