The Citroen C4 1.6 THP 150hp (2015 - 2019) produces 150bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 185bhp and 300Nm, a gain of 35bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.