The Audi A4 45 TFSI (2.0T) 265hp (B9 - 2019 ->) produces 265bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 310bhp and 490Nm, a gain of 45bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.