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I can't say which is best other than stock, but max is about 26 PSI, and then only for brief periods. Anything higher, or 26 prolonged, will almost definitely stretch the stock bolts.
 

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Discussion Starter · #3 ·
I ended up getting custom tunes and have reached north of 26psi... but I'm doing a full build soon so I'm not that worried bout it.
 
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