On stock fueling you'll be limited to 16-17psi to redline. If you want more boost you'll need meth or pi. I recommend pi since the meth is limited to around 23psi. With pi you can push over 27psi boost although you'll likely blow your turbo at that point.
Short answer is that you need port injection to truly max out this turbo.
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2019 SG M5C
2015 SO M3 6MT
2015 BSM M235xi
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