I have Ravelco installed hidden under the dash. It's the best immobilizer I've ever found and you'd have a hell of a time getting the car started even if you knew it was there. It would drive you crazy if you didn't know about it and it's pretty hard to find even if you are looking for it. And they are all installed differently, so no single procedure to follow to remove it.
Ravelco Anti Theft Device
Easiest way to steal the car would be to roll or tow it away, but you probably aren't driving it away. If they want it that bad, insurance can buy me a new one.....
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(Less time searching, more time wrenching & driving)