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You might of already addressed this but....
If you floor it from a complete standstill our stock turbos CAN'T make that much boost. In that situation our engines can consume everything that the turbo throws at it and the turbo can't build up higher than around 12 psi.
However, if you are low RPM's in 3rd or 4th gear, and you floor it, well then it's a different story. Because the engine can't rev high enough to consume all the air we are shoving at it, it allows are stock turbos to build more boost giving higher #'s. I can hit 19lbs of boost in this situation but to say "I run 19lbs of boost" is kind of a false statement. See attached image...
When you can run 20 or 22 lbs of boost from a dig with PS2, that is not a gain of only 3 lbs of boost, that's a gain of 8 to 10 lbs of boost! Apples to oranges comparison there.
Bmwdoubles_ has a boost leak video on you tube that's good.
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