With my last S2000 being taken from my house about three weeks ago, and it being found 150 miles away burnt to the ground, before I even noticed it missing. I can say that the stock alarm is not worth any money at all. There all installed in the same place, and if disconnected you can still start the car. With the LoJack. I'm getting it put in the new car this Saturday. Total cost was $590 and there coming to the house to install it.