Porsche 911 Carrera / S / GTS Valved Sport Exhaust System (991.1)Welcome to the Valvetronic Designs Catback system for the 991 Platform. This system has been designed from the ground up to give very rich F1 sound and to provide minimal frequencies when running in the valves closed mode. Featuring a large center X pipe, this valved system is the ideal setup for the 991 platform Porsche 911. Fitment 2012 2016 Porsche Carrera Carrera S Carrera GTS 2014 2016 Porsche Targa 4 Targa 4S Targa 4 GTS Also fits convertibles