depends on how you want it to look. I suggest taking a look at some 2.2 with different CAI's installed. I don't really belive that you get more out one then you do another, so I'll say its really up to you. I like the way my AEM looks and sounds, but i think my next one is DC Sports, or a custom bent one.
Check out ebay... search for 2.2 cobalt intake, and see what happens.