Porsche 911 Carrera GTS (991.2) ECU Tuning SoftwareOverview Porsche 911 Carrera GTS 991. 2" 3. 0 L flat 6 Twin Turbo 2017 Present Expertly calibrated and meticulously refined, HEX Tunings ECU software for the 991. 2 Porsche 911 GTS is guaranteed to give you MORE of a good thing. More horsepower, more torque, and a more exhilarating driving experience by delivering usable power through improved throttle response and torque management. With additional ft. lbs. of torque through the mid range,