The Subaru Legacy 3.6i 256hp (2015 - 2018) produces 256bhp and 335Nm in standard form. Our Stage 1 ECU tuning file raises output to 273bhp and 353Nm, a gain of 17bhp and 18Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.