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Since the 325, 328, 330 all have the same 3.0L motor, I'd think that with a chip/retune, it would be possible to get to at least 328i levels, maybe a bit more. The 330i has a 3 stage intake manifold - so unless you swap that, it would be harder to get to 330 level with just a retune and a few bolt ons.
I think turner motorsports offers a chip, but I haven't really looked into this yet
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