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well, i hate to be the devils advocate here, but i don't think you addressed the major problem of having a pressure drop in your manifold quite like you should have. everyone goes to huge lengths to eliminate all the pressure drops up to the manifold and big gains are seen from some (air filter, lower intercooler pipe, larger intercooler, upper intercooler pipe, throttle body), and then you are going to restrict the flow down to a tiny channel between plenums. it seems very counter productive simply to give a good distributed flow to each of the cylinders.
what mass flow rates were you using in CFD?
also, what were the velocities going across the channel?
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