The Maserati Coupe GT 4.2 V8 390hp (2002 - 2007) produces 390bhp and 451Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 475Nm, a gain of 30bhp and 24Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.