The Mercedes CLK 220 CDI 136hp (W209 - 2003 - 2009) produces 136bhp and 340Nm in standard form. Our Stage 1 ECU tuning file raises output to 180bhp and 400Nm, a gain of 44bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.