Jaguar XJ 4.2 V8 SC 400hp ECU Tuning File

The Jaguar XJ 4.2 V8 SC 400hp (2003 - 2009) produces 400bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 470bhp and 630Nm, a gain of 70bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.