Quote:
Originally posted by 05_X:
Some installers will file down metal part of the chipped key that is kept in the vehicle. That way, you have the chip in the car, but the key will no longer turn in the ignition even if some finds it.
True, but one of the reasons for the chipped key systems is to prevent unauthorized methods of starting cars (hotwiring, etc). With a valid key always registering with the system, a car thief has a much better chance of taking off with your X.

That said, it's hardly something you have to worry about in most cases. Car thefts in my area are low, so It's a useless point for me. But I'm not sure about Chicago.