The BMW 6 Series GT 630i 258hp (G32 - 2017 ->) produces 258bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 278bhp and 450Nm, a gain of 20bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.