The Mercury Mariner 2.5i 171hp (2005 - 2012) produces 171bhp and 232Nm in standard form. Our Stage 1 ECU tuning file raises output to 190bhp and 250Nm, a gain of 19bhp and 18Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.