Economy/ Performance/ Towing Tuning; Diesel Fuel; Tunes Automatic Transmission Shift Firmness and Shift Points; With Built-In Speedometer Calibrator; Without Top Speed Limiter; Without Rev Limiter Controls; Reads and Clears Diagnostic Trouble Codes; Fits Volkswagen Golf TSI Turbo 2009 to 20147 1.4 Liter and Volkswagen Jetta TSI Turbo 2011 to 2016 1.4 Liter