Porsche 911 992.1 & 992.2 GT3 Rear Silencer Exhaust by Milltek SportPorsche 911 992. 1 & 992. 2 GT3 Rear Silencer Exhaust by Milltek Sport Milltek's range of exhaust 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 their products are made from 304L Aircraft Grade