Either way it's mostly pretty much the same, just design the path of the air to be as straight as possible, sometimes pod filters aren't good for this, sometimes they are!
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The 2JZ setup always intreiged me, it appears to be quite extensively tuned and has a little box that shoots off to the side which I assume is supposed to assist throttle response by acting as a small reserve air supply.
It could also be to reduce resonance at a certain frequency I'm not sure on that one.