The Audi A6 RS6 5.0 TFSI 580hp (C6 - 2004 - 2008) produces 580bhp and 650Nm in standard form. Our Stage 1 ECU tuning file raises output to 680bhp and 750Nm, a gain of 100bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.