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It's called detonation.
I would stop listening to the people telling you "20 lbs with RAS ans stiffer valve springs". That doesn't make any sense. Stiffer valve springs are necessary when upgrading cams. RAS prevent the rocker arms from flying off at high rpm. Neither which have any affect on how much boost you can run on a given octane. You mention you have 550cc injectors. What is controlling them? Please don't tell me stock ECU.
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