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Actually, I had emailed AA last night.
They said that there is a difference between the S54 M3 tune and the S54 Z4M tune because BMW had changed the ECU settings between models.
They fixed a lot of things for the Z4M, so he said that an over the counter tune would work just as fine as a customized, car specific tune. Here is his email:
"The Z4M does not have quite the feature set on tuning that our E46 M3 tuning does. The DME hardware was changed between cars and uses completely different programming. The newer hardware in the Z4M DME requires less fine tuning than it's E46 counterpart, that means that an "off the shelf" tuning solution will be very accurate and does not need to be re-worked to offer the most gains. The sport button feature is actually not supported on this DME and the website will be corrected shortly. I hope this answers your questions."
I think I'm leaning towards Active tune. I can have it done at Turner Motorsports since they are a vendor.
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