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There is no CAI for 2IS unless you make your own custom one. The F-Sport drop in by itself is pretty good, the tube and lower box is what gives it the sound and performance though if anything.
There's benefits from using aftermarket filters, you could probably get away with just getting the Blitz, Tom's, or HKS drop in filter and be fine too.
so whats the advantage of using after market drop in filters?
Peace of mind thinking you have a higher quality air filter, and it's reusable, lasts longer.
Best advantage, to say you have an Aftermarket Filter!
The performance gain is so minimal ~1% at most, usually 0.5%, so you won't really notice it. I did notice a slight change in intake sound near redline though if that accounts for any reason to buy.