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i think it depends entirely on your abilities and/or those of your tuner. my car was 'professionally tuned' to run 13.5:1 afr @ 8psi WOT (at times even worse, holding in closed loop while it was at full boost). even with a tune that horrific it didn't blow up. so, at least they're not a ticking time bomb waiting for a chance to explode at low boost.
if you tune it right it won't blow up, and at least in my case it can apparently be tuned very, very, very wrong and still not blow up lol.
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