The McLaren 620R 3.8 V8 620hp (2020 ->) produces 620bhp and 620Nm in standard form. Our Stage 1 ECU tuning file raises output to 660bhp and 700Nm, a gain of 40bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.