The Mercedes GLK 200 CDI 136hp (X204 - 2010 ->) produces 136bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 480Nm, a gain of 64bhp and 130Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.