The Mercedes CLK 270 CDI 170hp (W209 - 2003 - 2009) produces 170bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 480Nm, a gain of 30bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.