The Audi A6 55 TDI (3.0D) 349hp (C8 - 2018 ->) produces 349bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 380bhp and 840Nm, a gain of 31bhp and 140Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.