The Citroen C5 2.2 HDiF 173hp (2008 - >) produces 173bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 440Nm, a gain of 27bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.