The Citroen DS4 1.6 THP 155hp (2011 - 2015) produces 155bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 190bhp and 310Nm, a gain of 35bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.