The standard power of your Citroen C4 2.0i 16v 138hp vehicle is factory 138 hp / 190 nm. After Citroen C4 chip tuning custom vehicle software, your vehicle will gain +10 hp / +20 nm additional power and reach a total power of 148 hp / 210 nm. Since there will be no change in the exhaust emission values of your vehicle, there will be no smoke in your vehicle.