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Stock headbolts and your pushing 25+ PSI?? Ughh I dont think that the 2g bolts are much, if any, stronger than 1g bolts...
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The 92.5+ bolts are weaker due to being a 1mm smaller.
Bad injectors? Are they black from fuel or oil?
Semi-blown headgasket? Might only be blown enough to cause problems at high boost, but that might just cause it to overheat a little and push coolant, but not misfire.
Are you I/C pipes free of oil? A little oil from a slightly blown turbo seal or accumulated in the intercooler can cause misfires under boost.
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