The Porsche Cayenne S 4.5 V8 340hp (955 - 2002 - 2007) produces 340bhp and 420Nm in standard form. Our Stage 1 ECU tuning file raises output to 360bhp and 445Nm, a gain of 20bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.