The stock boost level is the highest amount you can run safely.
If you want to raise your boost, you can, but not without consequences. With engine management and a catless exhaust system, you should be able to run 16.5 psi or so safely, but that is not a guarantee. There are too many variables that go into it.
If you have all of the right mods, your stock turbo can probably handle 17-17.5 psi.
That includes catless uppipe, turboback, engine management, bigger IC.
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