The amount of modification to your car depends on which kit that you go with. A fmic is a part that you really should research well before buying. You should get one that will compliment the turbo set up as far as flow goes. Too big and you'll have great cooling, but slower spool. Too small and you'll have the opposite.
I'd find out which turbo that you'd want to get before you get a bigger IC. That way you'll get the right part for you're money and not have to do it twice.
My car is well, it's like 10 lbs of shit in a 5 lb bag...
<------ Click to see what I'm workin' with. ;)