I've replaced mounts on three different Boxsters over the last few years. Shifting improves, idle is smoother and no harmonic vibration at ~3K rpm are the main things that get fixed.
I did swap just a bushing in the mount one time and it wasn't very hard to do. The bushing as $39. Prior to removing the old bushing, I marked it and its position in the mount. I then sat the new bushing on top of the old, alingned the holes and marked it as well.
I put my motor mount in a vice and used a hack saw to break up the old mount and pull it out. It was quite easy to do by hand. I then took my new (Frozen) bushing, alinged the holes and pressed it in using the vice. It when right in without any drama.
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