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the last few posts have hit the nail on the head however I would like to add to it, think of it this way, keep the fuse high, when something goes wrong and the tune is bad, or you spike boost or lose boost or any number of things that could happen would you rather replace a head gasket or something more expensive? personally I like to leave my head gasket as a weak point on the engine, detonation causes combustion pressure to spike when it does would you rather blow that pressure through the head gasket or bend a rod? or even less blow out your rings or any of the other number of things that could happen from detonation, no matter what your replacing a head gasket anyways
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