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From experience helping moderate a large forum for a car marque that is high on the list for theft...
Adopt a multi layered approach starting with the home.
Make sure the BMW firmware patches have been applied.
Faraday pouches for your keys, especially if you have comfort access.
Mechanical protection such as the Disklok.
Autowatch Ghost - google Chris Preston of Veil Tuning who seems to be the "go to" guy for this system.
Food for thought and I hope it helps.
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