Solid mounts are ideal for any SC. Obviously if they are not trashed I wouldn't worry about them just yet. This is one of those things you should upgrade when they go, or if you plan on running some significant hp.
I wouldn't say they are hard to change, just more time consuming then anything else. I had to jack up the engine a bit to make room for my change. All in all, it's not that bad.
good luck
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