The factory spec'd transmission mounts for the E30 M3 are not particularly rugged.
This should be fairly obvious from the photo above, which shows the factory mount on the left.
It is clear that one of the primary goals at Motorsport for the publicly sold E30 M3 was to minimize
intrusion of the S14's notorious vibration into the cabin. The factory mounts do a good job of
damping out vibration in conjunction with the original motor mounts (as good a job as they can anyway).
But there is another BMW produced motor mount from the e24 series which is cheap, much stiffer, and basically
bolts right up. This mount is shown on the right in the photo above.
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