The Mercedes GL 350 CDI 265hp (X164 - 2006 - 2012) produces 265bhp and 620Nm in standard form. Our Stage 1 ECU tuning file raises output to 295bhp and 700Nm, a gain of 30bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.