Mercedes AMG CLS 63/ 63 S (W218) ECU Tuning SoftwareOverview Mercedes AMG CLS 63 63 S (W218 5. 5 L V8 Twin Turbo (M157) 2011 2018 Expertly calibrated and meticulously refined, HEX Tunings ECU software for the W218 Mercedes AMG CLS 63 CLS 63S 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