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I've plugged them before and autox'd on it. As long as it's in the tread and not the sidewall it should be fine. I did it with those kits you can get from wherever (plug from outside, don't need to remove wheel) - ream hole, shove the plug material in, cut off leftover gunk. No issues and held pressure as good as normal - not sure if racing orgs have any guidance about this though.
Edit: not specifically Z2's but other extreme performance tires.
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