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You can buy the kit for ~$250 and install it yourself. The most complicated part on my 330i was removing the rear whell on the driver's side to install the siren. However, you must then take it to the dealer to have it programmed. In Seattle, that will cost you over a hundred bucks. On my car, the alarm didn't work at all until it was programmed, YMMV.
Still, I figure that I saved about $600 by doing it myself.
Cheers.
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