depends lah what type of OEM ecu you running in ur car presently...if you are using Mitsu Ecu emanage is good enough but if you using newer version of Siemens Ecu emanage, safc. Sitc is not compatible...I've tried it before..My car is Gen2 using siemens so currently using Obit, which has more features compared to the older blue emanage and Safc..it's on par with the new Emanage though..
Tuner also play important part, best you get a tuner who had tuned and installed the piggyback on a similar car to yours..best is if you get to test drive his customer's car..Dont trust dyno charts too much..I've seen fantastic dyncarts of modded cars before but when driven feels like shit...
for more info on obit ;
www.perfectpower.com.sg