The Audi A8 3.0 TDI 258hp (D4 - 2010 - 2016) produces 258bhp and 580Nm in standard form. Our Stage 1 ECU tuning file raises output to 300bhp and 650Nm, a gain of 42bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.