7psi to be safe then. but injectors arent really that pricey so just upgrade to bigger ones and boost it more. Of course then there could...no...would be the pistons that could go, seize the valves, etc etc etc. Just do the 7psi. I wouldnt go anymore than that until I ran it for a few weeks and everything was still A-OK. Maybe after that boot it by 1 or 3 max.
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