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How many "air box[es] in the middle" do you see? I count two. The manifold treats the engine like a pair of 3 cylinder engines until the IRIS valve opens.
You're looking at an active, two stage intake manifold. If you haven't done anything to your cams and heads, I'd say that intake manifold restrictions are not a concern.
If you're not going to do any substantial breathing work, then a new manifold design is a lost cause, imho. Bang for the buck, there are plenty of better things to do.
Do some research. Learn how stuff works. Find out where things actually can be improved.
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Disclaimer: The above post is on the internet.
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