Theres no point making your car faster if it's standard,sort the handling and stopping first! Then sort the fueling,exhaust,manifold,actuator for more power and turn up the boost to a sensible level as enzo has said. If you just go straight for power you'll be in the ditch pretty quickly or have a nicely toasted set of piston rings causing mucho smoke! Does your car travel in mph or kph? if it's still reading kph then it's not derestricted.Do you have the converter fitted?