The Mercedes GL 320 CDI 211hp (X164 - 2006 - 2012) produces 211bhp and 510Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 600Nm, a gain of 49bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.