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Didn't the 3-series folks work all this out a year ago? To get the Z4 3.0si (or 330i) power out of a 3.0i (or 328i) you need to 3-stage manifold and a tune. Gintani/OE tune works as do others. Straight tune without the manifold gets you about 10 hp on the 3.0si. I think maybe a bit more on the 3.0i, but to see the full gains you'll need the si manifold. Search around on e90post and you'll find details.
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