The Audi S5 4.2 V8 354hp (8T - 2007 - 2016) produces 354bhp and 440Nm in standard form. Our Stage 1 ECU tuning file raises output to 375bhp and 465Nm, a gain of 21bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.