The Dodge Durango SRT 6.4 V8 Hemi 475hp (2010 ->) produces 475bhp and 637Nm in standard form. Our Stage 1 ECU tuning file raises output to 495bhp and 655Nm, a gain of 20bhp and 18Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.