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all of the exhaust intake design books I have read have a formula for figuring out ideal intake size based of engine size and the speed that you want it to run most efficiently at, to keep air velocity up you want an intake that is long enough to maintain the pressure pulse between valve openings, but not so long that it creates drag, the higher you rev the engine the larger around and shorter the intake should be, if you want good efficient low end power then you want a small around longer intake, it's fallowing the same laws of physics as any musical wind instrument, change the size to much without changing the air flow and it will go out of tune and fight it's self.
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