the reason why rinagi said so because this topic has been discussed in detail somewhere in one of the threads earlier and the explanation, pros, cons and pricing has been listed there
if u have ample time, it is best for u and all newcomers to go through all the earlier threads rather than posing a "blind question"
im using a satria evo, it has been locked to 2wd, as u can see, the oem ecu setting is for 4wd aite? so that mean the fuel must be rich rite now, so which one is better to optimize my setting for fuel consumption...