“Mercedes-Benz AMG GT/GTS/GTC Custom In-House Dyno Tuning” has been added to your cart. Continue shopping 2015-2018 C300 TCU TUNING , 2019-2021 C300 TCU TUNING MERCEDES-BENZ TCU TUNING Enhancements:TCU Torque Limit RemovalTCU Speed Limiter RemovedBroader & Stronger Power BandReduced Transmission SlippageFirmer Transmission Shift PatternsIncrease Transmission Shift SpeedIn-House Engineered & Tested ResultsSmoother Firmer Transmission Shift Patterns 15 reviews -