The Jaguar XJ R575 5.0 V8 Supercharged 575hp (2009 ->) produces 575bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 600bhp and 750Nm, a gain of 25bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.