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People that "run 20psi" on a T28, how often do you think they're hitting 20psi?
If you do that for a 1/4 mile drag, sure, fine, whatever, probably won't blow it up, but that turbo's lifespan will be shortened, guaranteed.
If you do that for a duration of a full 20 min hot lapping session for road racing, it might blow up after a couple of months if you race every week.
If you run that same turbo on like 14psi, but run no BOV, it'll last longer than a couple of months.
That's the difference.
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