Home » GEMBALLA GT Cabrio – See and Hear The Amazing Porsche 911 Carrera Upgrade » GT_Exhaust start and full power (valve open) GT_Exhaust start and full power (valve open) https://www.car-revs-daily.com/wp-content/uploads/2014/11/GT_Exhaust-start-and-full-power-valve-open.mp3 “GT_Exhaust start and full power (valve open)”. Home » GEMBALLA GT Cabrio – See and Hear The Amazing Porsche 911 Carrera Upgrade » GT_Exhaust start and full power (valve open)