The BMW 6 Series GT 640i 340hp (G32 - 2017 ->) produces 340bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 580Nm, a gain of 60bhp and 130Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.