The Citroen C5 2.2 HDI 136hp (2001 - 2008) produces 136bhp and 317Nm in standard form. Our Stage 1 ECU tuning file raises output to 170bhp and 400Nm, a gain of 34bhp and 83Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.