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Hi Mark,
intake style is somewhat dictated by the camshaft choice. Individual throttles help with reversion for cams that have a lot of overlap. Common plenum with single throttle limits cam choice to those that typically have less overlap. Plenum over ITB is a way to run more aggressive cams and use resonance tuning to help broaden and enhance the power curve. GT3 intake is often referenced for larger engines and 964 plastic runners for smaller. When used on top of ITB the front crossover where the throttle would normally be becomes a air filter inlet. The rear cross over tube has the resonance flap that is opened or closed depending on RPM. I do not know enough about intake design to know if there is a reason Porsche did not use a single center chamber or if it was a packaging decision.
john
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