The Citroen DS4 1.6 VTi 120hp (2011 - 2015) produces 120bhp and 158Nm in standard form. Our Stage 1 ECU tuning file raises output to 135bhp and 180Nm, a gain of 15bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.