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Pressure is "specific force" in a sense, so the difference in pressure dictates a difference in force acting on the fluid.
Knowing that you want to see the positive pressure part of the wave to arrive when the intake valve closes, the intake runner length has to be like 3.5 meters long or something to catch the wave the first time it comes back, but the runner lengths you see on cars are more like 1/20th of that, so I need to go think about this more sometime. I'm guessing that a cylinder can utilize the wave generated by another cylinder or something like that, which makes things quite complicated.
At any rate, the intake "frequency" appears to be best matched to the mid 2000s range.
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