FMIC should be one of your later mods. NOT something to do right away. I found a Conquest FMIC for less then $30 bucks, pipes, core and everything. So, i upgraded now figurng i'll be ready when it's needed. It only prevents heatsoak. There's not a huge performance gain, or any at all at 12 PSI.
I don't like to link other sites, but this guide i think is a very good one for what to do on moding your car.
http://www.machv.com/goinfasenand.html