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Many N.A. Porches (including the one I used to own) have intake manifolds with a pair of large reservoirs near the manifold intakes, and some sort of resonance balancer between the two reservoirs that is separate from the intake throttle body.
I suspect the reservoir-to-intake runners might act like short intakes. But this is just a suspicion; I never looked inside mine to see how it worked.
I can say that modifying the intake splitter (just downstream from the throttle body) by inserting a smoothed wedge to make more of a "Y" shape rather than the stock "T", helped torque.
Not sure how much of this could be made and sold without licencing their patents, but worth looking into I think.
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