The Maserati Quattroporte 4.2 V8 400hp (2004 - 2012) produces 400bhp and 460Nm in standard form. Our Stage 1 ECU tuning file raises output to 425bhp and 485Nm, a gain of 25bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.