The Smart ForFour 0.9 Turbo 90hp (2014 ->) produces 90bhp and 135Nm in standard form. Our Stage 1 ECU tuning file raises output to 110bhp and 155Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.