Mercedes AMG G63 ECU Tuning SoftwareOverview Mercedes AMG G63 5. 5L V8 biturbo 2012+ Expertly calibrated and meticulously refined, HEX Tunings ECU software for the Mercedes AMG G63 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 as much as 100+ extra ft. lbs. of torque through the mid range, acceleration out of your favorite