The Audi S4 2.7T 265hp (B5 - > 2000) produces 265bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 315bhp and 480Nm, a gain of 50bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.