The Dodge Challenger R/T 5.7 V8 372hp (2008 ->) produces 372bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 390bhp and 560Nm, a gain of 18bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.