The Citroen C5 2.0i 16v 136hp (2001 - 2008) produces 136bhp and 190Nm in standard form. Our Stage 1 ECU tuning file raises output to 146bhp and 205Nm, a gain of 10bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.