I don't think the roughness/harshness is an issue with resonance TBH.
I think it mostly has to do with the fact that the engine isn't balanced. You almost never see a v6 revving up this high, especially not one with this old of a design.
It's really not possible to have a smooth, high-revving V6, and our engine just helps demonstrate it.
EDIT:
Yes, a heavier flywheel would likely smooth things out, but that's not a performance knock I'd be willing to take...
Especially since it likely would only make a VERY small difference...
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