The Mercedes GLK 200 CDI 143hp (X204 - 2008 - 2010) produces 143bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 480Nm, a gain of 57bhp and 130Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.