The Audi RS3 2.5 TFSI 400hp (2017 - 2020) produces 400bhp and 480Nm in standard form. Our Stage 1 ECU tuning file raises output to 470bhp and 620Nm, a gain of 70bhp and 140Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.