Firmer mounts = more vibration... also I have seen a few broken solid mounts for the Z, so I'd do some extra research before buying...
In theory, it's less torque lost and thus faster driveline response. You won't see it on a dyno, but as wstar noted, you will FEEL it when you throttle on.
At idle you'll feel it too, tho'...
If you don't mind some extra vibration, and they won't crack, sure why not?
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