The Ford Mustang GT 5.0 V8 420hp (upto 2014) produces 420bhp and 524Nm in standard form. Our Stage 1 ECU tuning file raises output to 445bhp and 554Nm, a gain of 25bhp and 30Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.