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have you ever owned poly mounts?
its not a big deal at all
done commonly and often, using this kind of bushing with interlocking internals
I DD my other urethane mounts, no issue at all, no extra NVH, except at startup, while cranking, its a bit more palpable thru the frame
most cars doing mounts already have a lil extra NVH from exhausts and such, so the fractional incremental amount of extra or added NVH is truly negligible.
perhaps if you were adding these mounts to a bone stock car, with bone stock exh, you may better be able to find those key differences
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