The Mercedes C 450 AMG 367hp (W205 - 2014 - 2018) produces 367bhp and 520Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 590Nm, a gain of 53bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.