The Audi S6 2.9 TFSI 450hp (C8 - 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.