The Audi A4 S4 3.0 TFSI 333hp (B8 - 2012 - 2015) produces 333bhp and 440Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 520Nm, a gain of 67bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.