Audi S4/S5 B9 Non Sport Diff models - Non-Resonated (Louder) Cat-Back Exhaust System with Quad GT-90 Cerakote Black Trims Trackslag The valves open or close

The valves open or close depending on the mode selected - so you can keep sound levels in check or unleash the full potential of the engine

For those looking to take the style upgrade a stage further

For those who want added audible emotion with ninja like sleeper styling

** Can only fit to Milltek downpipes if MSVAG08 connecting pipe is used **

5db on the sound meter

Audi S4/S5 B9 Non Sport Diff models - Non-Resonated (Louder) Cat-Back Exhaust System with Quad GT-90 Cerakote Black Trims Trackslag The valves open or closeOur 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