The GMC Terrain 3.0 V6 264hp (2009 - 2015) produces 264bhp and 301Nm in standard form. Our Stage 1 ECU tuning file raises output to 285bhp and 320Nm, a gain of 21bhp and 19Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.