The BMW M8 4.4 V8 Bi-Turbo 600hp (2019 ->) produces 600bhp and 750Nm in standard form. Our Stage 1 ECU tuning file raises output to 680bhp and 850Nm, a gain of 80bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.