Milltek Sport | Cat-Back (Valved, Non-Resonated) MK6 RMilltek Sport Cat Back (Valved, Non Resonated) Volkswagen Golf R MK6 Milltek Sport's 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