The Jaguar XJ 3.0 V6 Supercharged 340hp (2009 ->) produces 340bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 390bhp and 500Nm, a gain of 50bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.