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my F30 doesn't have the OEM system, so I'm looking for an aftermarket system.

never needed to research as all my past cars had an alarm (audible sound lock/unlock also).

can comfort access be bought aftermarket? Hoping for a simple key fob to add to the keychain.

don't have to worry about protecting the car from theft with our key system, but would like to have an audible annoyance if someone smashes my window.

but if they really can steal our car, a GPS tracking would be nice also.

remote start isn't needed.