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I don't agree 100%! I'm running the OEM setup just fine. The trick is to run a solid state fuel pump controller. I am running 25psi at idle, ramping up to 72psi at boost,
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But your fuel pump controller is regulated by your intake manifold pressure sensor? thats a bit the same as a vacuum controlled pressure regulator, only done electrically (and thus probably with a lot more tuning possibilities). But the stock z4 doesnt have that possibility, at least not with the m54 engine), because that engine doesnt have a manifold pressure sensor (I was looking at the problem from my situation)
Do you have a picture of the 3.0si/z4m pump? (preferably with the numbers)
Is the white assembly also different?
Whats the difference in diamater in the lower fatter part? (mine is 45.41mm to be exact
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Pump can also be an earlier style model (m54 is of course an older engine, ive seen that the ridge between the thick and thin can part is more straight on the one in my pic compared to the current TI/walbro design). Manufacturers usually stay very long with the same OEM, especially bmw.