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@Dammit
The charts are the result of testing the head, intake and exhaust manifolds on a flow bench. The goal is to identify what the stock setup would yield, should everything be optimised (circa 375bhp in 3.7l guise) and then extrapolate from what we have to what we might get should the heads, cams, intake and exhaust be developed - between 415 to 430 bhp.
The head is capable of flowing more air than the stock intake manifold can supply to it, and that the tubular manifold can then get rid of.
When you compare flow value increases from going to the 100mm bore you can see that the exhaust side benefits more- and is also a bigger restriction than the intake, this suggests that investing in an exhaust manifold that is less restrictive is where your money should go first.
Next question to answer is what do the results mean in the context of a road car engine, and that's still unanswered.