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Physically, I'm not sure if the N43/46 transmissions will bolt up to the N52. Perhaps it may need some modification.
They will have different torque converters, and possibly different gear ratios. You could try flashing the 330i software to it, but it will not perform exactly how it should, because of this.
I think for it to work perfectly, you'll need to use an N52B30 6HP21. (torque converter differs between N52B25 and N52B30).
If you can't find an E9x N52 6HP21, another option is to take one from the LCI E60 530i. That gearbox is electronic shifter only; the E60 e-shifter will definitely work but might need modification to fit. E89/E84 8HP shifter will bolt into the E90 chassis, and should be electronically compatible. I don't recall if the E60 6HP21 needs a the parking lock cable, you would have to find out. With this combination you could use the E60 Sports Automatic Transmission coding, which gives much faster shifts than the stock E90 6HP21.
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