The Mercury Mountaineer 4.6 V8 292hp (2005 - 2010) produces 292bhp and 427Nm in standard form. Our Stage 1 ECU tuning file raises output to 310bhp and 450Nm, a gain of 18bhp and 23Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.