The Citroen C4 X 1.2 Puretech 100hp (2023 ->) produces 100bhp and 205Nm in standard form. Our Stage 1 ECU tuning file raises output to 145bhp and 270Nm, a gain of 45bhp and 65Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.