The Audi S7 4.0 TFSI 420hp (2012 - 2019) produces 420bhp and 550Nm in standard form. Our Stage 1 ECU tuning file raises output to 540bhp and 800Nm, a gain of 120bhp and 250Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.