The Mercedes CLK 200 K 184hp (W209 - 2003 - 2009) produces 184bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 195bhp and 265Nm, a gain of 11bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.