Audi S5 B9 Coupe/Cabriolet Non Sport Diff models - Non-Resonated (Louder) Cat-Back Exhaust System with Quad JET-100 Carbon Trims Audi > RS4 > B8 4.2 FSI quattro Avant > 2012 to 2015 OEM operation for your 1

OEM operation for your 1

Boost leaks = loss of power

That being said

The M4 development has been based around a valved cat back exhaust with the addition of a secondary de-cat (catalyst bypass) exhaust upgrade

Cobra Sport has created a direct replacement single exit exhaust system built with 2

Audi S5 B9 Coupe/Cabriolet Non Sport Diff models - Non-Resonated (Louder) Cat-Back Exhaust System with Quad JET-100 Carbon Trims Audi > RS4 > B8 4.2 FSI quattro Avant > 2012 to 2015 OEM operation for your 1Our 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