The Dodge Magnum SRT8 6.1 V8 425hp (2005 - 2008) produces 425bhp and 469Nm in standard form. Our Stage 1 ECU tuning file raises output to 445bhp and 490Nm, a gain of 20bhp and 21Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.