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It depends on the cross section area of the runners where you want to know the air flow.
If the area cross section is twice as much I suspect the velocity will be half as much. If it is for times as much air flow will probably be about 1/4 the the velocity.
But I am not a math guy so I could be wrong.
All those little intersections also create turbulence and thus back pressure. It is interesting how an elbow creates turbulence and back pressure as the air has to take longer and shorter paths around the turn. Most the new cars now use flat tubes as runners to make turns more efficiently.
I think longer runners are for low end and short runners for higher rpm power.
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