The Citroen C5 2.2 HDI 163hp (2008 - >) produces 163bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 195bhp and 435Nm, a gain of 32bhp and 65Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.