This is Milltek Sport's non-resonated (louder) cat-back exhaust system fitted to a B6-edition Audi S4 4.2 V8. Note that this is cat-back only and the car is still fitted with the OEM catalysts.
Milltek Sport also offers either hi-flow sports catalysts or catalyst bypass pipes as a replacement for the OEM catalysts which gives extra power and an even more thrilling soundtrack!
Many thanks to UNT Design & Performance in Poland for sending us this clip.
