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Jeff: also what do you think of choosing different materials for prototypes? Plastic plenums, plastic/silicon hoses and such .. shouldn't it make much cheaper/quicker prototype turnaround (if not on-site adjustment)/requiring less work to test multiple configurations vs welded metallic one? Flexible hoses also should enable simpler testing of constructions less tied to cylinder location/manifold plenum size & shape, allowing eg. even longer runners, if one were to test longer then distance from cylinders and rigid plenum width. If some such temporary prototype of cut hoses config may show up promising, just then think of putting it into "iron", with putting extra length via extra bends, connection to back of plenum, not sides, for example.
Also .. do you still have stock resonators with your intake manifold or they are deleted? Shouldn't volume of them also be added to stock plenum volume, as it's "after" most restrictive bit, airfilter? That "reserve" probably will affect more throttle response, not flow
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