The Citroen C4 1.6 HDi 16V 110hp (2004 - 2010) produces 110bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 140bhp and 330Nm, a gain of 30bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.