The Citroen C4 1.2 PureTech 155hp (2020 ->) produces 155bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 165bhp and 290Nm, a gain of 10bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.