I received my chip today!

and my big PHP mouth sticker
i am installing it later today.... but i was wondering....
at any psi in boost does the truck start to de-fuel? also how much psi can the turbo handle (not on a daily basis but more of like a once in a while drag or dyno run)???
thanks!
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2001 F250 X-cab 7.3 4X4
Performance
-afe stage 2
-mbrp 4" straight pipe w/ rbp 6" tip
-autometer gauges: trans, egt, boost
-zoodad
-PHP/TW "twin tuned chip" (on the way)