The Citroen C5 1.6 THP 156hp (2008 - >) produces 156bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 190bhp and 310Nm, a gain of 34bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.