Mate you need a stand alone ECU once u start boosting over the 200rwkw stage...i wouldnt recommend a piggy back ecu such as safc or emanage.
Have to change fuel maps, timing, air flow etc..
Dont buy a pggyback system...waste of money...
i recommend u purchase a powerfc or microtech , autronic etc something around those types
+ you have to upgrade your injectors if your trying to achieve 250rwkw
Basically what the guys said above u have to do...