Have you done brakes/handling already then? I know everyone says it, but its true. No point in having extra power, if the first time you use it, you end up in a hedge.
The Sti intercooler is bigger, therefore a greater volume of air can be cooled, with that your'll also need the undertray and the scoop.
If changing turbo, Id change injectors and fuel pump at the same time, or you'll just have to do it in the future, with yet another map.
