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I don't know exactly. I know some people are running 28-30psi with the internally gated versions. Internals often have a trade off of not being able to run high boost stable or creeping at low boost. JET is running a PTE with an internal gate, I am not sure if he has tried to run over 24psi yet though. I am not a big fan of internals, you will get better spoolup with an external and usually get very stable boost control.
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