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Cold air intake - design?


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I wonder if anyone could provide some ideas on a cold air intake design. Over-the-radiator (OTR) cold air intakes are all the rage down here for LSx engines (not sure about the US), I personally am more taken with the aesthetics than the reports of improved engine performance.

 

I have just had a radiator made that will allow me to run an OTR intake on my LS1/S30 and I have made a mock-up based on the standard commercial design. It looks a bit bulky and I thought to scale it down a bit. If the throttle body on the LS1 intake is around 85mm dia, (64cm2) is there any need for the cross-section of the intake to be any larger, other than at the mouth where the filter restricts air flow?

 

Why do you think the commercial intakes have such large cross-sections right up to the throttle body? Thanks.

 

Commercial intakes = http://shop.ebay.com.au/?_from=R40&_trksid=p4522.m570.l1313&_nkw=otr&_sacat=See-All-Categories

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