Field VIN is required Sorry, this product cannot be purchased. C300 TCU TUNING , C400 TCU TUNING MERCEDES-BENZ TCU TUNINGEnhancements: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 13 reviews -