The Mercedes GT Black Series 4.0 Bi-Turbo 730hp (2017 ->) produces 730bhp and 800Nm in standard form. Our Stage 1 ECU tuning file raises output to 790bhp and 1040Nm, a gain of 60bhp and 240Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.