The Mercedes CLK 320 V6 - 218hp (W209 - 2003 - 2009) produces 218bhp and 310Nm in standard form. Our Stage 1 ECU tuning file raises output to 230bhp and 330Nm, a gain of 12bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.