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Always double check the gap. Don't assume, even if they are pre-gapped. The oem plugs at oreillys were suppse to be pre-gapped, but they all had the wrong gap settings. Better to check then having to do the job again because your car is idling rough.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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