The Porsche Cayenne S 4.8 V8 400hp (958 - 2010 - 2014) produces 400bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 425bhp and 530Nm, 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.