Audi RS4 4.2 FSI V8 420hp ECU Tuning File

The Audi RS4 4.2 FSI V8 420hp (B7 - 2004 - 2008) produces 420bhp and 430Nm in standard form. Our Stage 1 ECU tuning file raises output to 440bhp and 455Nm, a gain of 20bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.