The McLaren 625C 3.8 V8 625hp (2014 ->) produces 625bhp and 610Nm in standard form. Our Stage 1 ECU tuning file raises output to 680bhp and 700Nm, a gain of 55bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.