The Audi A4 2.0 TFSI 252hp (B9 - 2015 - 2018) produces 252bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 310bhp and 450Nm, a gain of 58bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.