If are looking for some extra power, I would make the engine breathe a little easier by adding a 3 inch turbo back exhaust with a high flowing cat, I would personally keep the standard air box and just get a high flowing panel filter, but if you like the pod you can go pod. And for the intercooler, depending on how much power you're looking for, a JustJap kit should be enough. Cheap and good enough quality from what I've heard.
Raise the boost to about 12psi and also get a new fuel pump to support. I think that should be enough for now.