The Mercedes CLK 240 V6 - 170hp (W209 - 2003 - 2009) produces 170bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 180bhp and 255Nm, a gain of 10bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.