The only kit that is a direct bolt on is the ETS. If you can fabricate, then the sky is the limit. However, if you are on a budget, the evo 8 intercooler has been used with minor modification. Also, the starion intercooler or JDM galant rs intercoolers have been made to work. In the end, your choice of intercooler should be made to match your current setup, future goals, budget, fabrication skills, time, etc.
Oh, and use the search function. I'm sorry I had to say that, but its true. Here's a few pointers:
Use a + in front of keywords and a - in front of words you don't want to pop up. Also, you can use "" to enclose key phrases.
I'm sure if you searched '+intercooler -re: -fs:' you'll get a bajillion different topics