The Audi A6 4.2 FSI 350hp (C6 - 2008 - 2010) produces 350bhp and 440Nm in standard form. Our Stage 1 ECU tuning file raises output to 365bhp and 465Nm, a gain of 15bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.