The Citroen C4 2.0 HDi 163hp (2010 - 2015) produces 163bhp and 340Nm in standard form. Our Stage 1 ECU tuning file raises output to 190bhp and 400Nm, a gain of 27bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.