The Smart ForFour 1.5 CDI 68hp (2004 - 2014) produces 68bhp and 160Nm in standard form. Our Stage 1 ECU tuning file raises output to 92bhp and 210Nm, a gain of 24bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.