90 octane will start knocking at around 17psi on a big turbo. After that you'll have to run a meth system and you can see 23ish psi. On gas alone without meth you'll need most likely 95-97 octane and 25-27psi of boost to get the number you're looking for. I'd search for some 100 octane and mix a couple gallons of that with a couple gallons of 90 octane and see how she does, then go from there.
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