The McLaren 600LT 3.8 V8 600hp (2018 ->) produces 600bhp and 620Nm in standard form. Our Stage 1 ECU tuning file raises output to 660bhp and 720Nm, a gain of 60bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.