Looks like Porsche has decided use the Helmholtz chamber theory that the SVX has had, to increase the torque at the 3000+ rpm area. This is mainly adaptable to 3, 6, and 12 cylinder engines.
It looks like they use a different tract for the high end resonance, by the flaps that change the inlet tracts from the inertia system tracts, to the different length resonance tracts. The SVX uses the same inlet tracts for both the inertia, and the resonance system, as it has a lower peak torque rpm.
Nothings new is it???????????
Harvey.