The McLaren 720S 4.0 V8 720hp (2017 ->) produces 720bhp and 770Nm in standard form. Our Stage 1 ECU tuning file raises output to 820bhp and 880Nm, a gain of 100bhp and 110Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.