Porsche 991.1 Carrera/GTS - Valved Exhaust (for PSE)ATTENTION! This exhaust system is ONLY for 991. 1 Carrera GTS that were delivered with a double tailpipe covers (quad tips) as standard. This system does not fit the oval tailpipe exhaust variant. This system is sold WITHOUT the CAPRISTO Programmable Remote Control System. This is for the Porsche 911 model 991 having the on board Porsche Control System (aka Porsche Sport Exhaust Option). If you don't have the Sports Exhaust Option you can buy a