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Originally Posted by RichReg
Its either there or it isn't. As an accessory for the E46, it comes with the siren. So either BMW isn't publicizing the alarm in their E90 brochures, or it's not standard. I'll let you decide the answer to that.
Then again, one would have to wonder why its not in the accessories listing.....
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I know for a fact there's some kind of anti theft system with acoustical settings because I read the owners manual pdf from this site and that was a menu on the iDrive screen. I just don't know what the anti theft system is.