The Maserati GranTurismo 4.2 V8 405hp (2007 - 2016) produces 405bhp and 460Nm in standard form. Our Stage 1 ECU tuning file raises output to 430bhp and 495Nm, a gain of 25bhp and 35Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.