The Akuma intake is an awesome piece, indeed. Almost picked one up a couple of years ago. Sadly, this is pretty much a one-of-kind intake and not many have it.
If Presto ever gets off his *** and goes FI, you might be able to snatch his up.
On to your answer... No point in going large like that and having to get a tune to make it work unless you do it all the way. Larger throttle bodies would likely be a good decision. May not net you much in terms of power gains (if any at all) but response may be enhanced slightly. Small cost compared to the intakes (5-600 + $1,500 for tune and dyno + a few hundred for a throttle body).
I only say that because of the hassle of going large. If you don't want to deal with it (most don't) then get the G3s or the Nismo CAI.
Good luck!
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