It really just depends on what your engine can handle. On a stock block tuned for 12lbs and you over boosted to say 15lbs once for a second, I wouldn't worry. But if you did it more than a few times it adds up and won't end well.
What's causing your over boosting ?
I use mine a bit different from the manual,
I'm tuned for 13lbs but actually have my target boost set at 12 lbs and over boost shutoff set at 12.9 right now because I'm at 90% duty cycle on my injectors at 13 (750cc).
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