Larger volume of air/fuel along with a smooth air will generally produce more power. Only things that will restrict it will be intake CFM. This can be exacerbated by to small a throttle body/s, or reduced positive intake pressure.
The idea here is to speed up the flow of Air/Fuel and balance the charge to each cylinder without disrupting it in the process. I could only show you on a flow bench, as a practical application.
FI engines are not as dependant obviously as an NA engine, although they can benefit additional the additional flow characteristics. I could go on about the size of plenums, tubing bends and lengths, deck heights, circumferences etc. as it would only confuse some. Believe me, it's a bit more complicated then welding some stainless tubing and air boxes togather to design a horsepower making intake manifold.
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