The Jeep Grand Cherokee 5.7 Hemi V8 325hp (2005 - 2011) produces 325bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 345bhp and 520Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.