The Audi RS4 2.9 V6 Bi-Turbo 450hp (B9 - MK1 - 2017 - 2019) produces 450bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 510bhp and 780Nm, a gain of 60bhp and 180Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.