The Citroen C5 2.2 HDiF 173hp (2001 - 2008) produces 173bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 205bhp and 440Nm, a gain of 32bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.