The Mercedes GLK 220 CDI 170hp (X204 - 2008 - 2010) produces 170bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 240bhp and 580Nm, a gain of 70bhp and 180Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.