Anybody know how this transfers to your car? I expect that if I was in my car and somebody tried to carjack me I would be allowed to use deadly force. What if I was in my house and I saw somebody trying to break into my car? If I confront them and they dont stop could I legally shoot:?:
No.

You can not shoot someone over property. In a car jacking, your life maybe at risk if the car jacker has a weapon, or there are mutiple car jackers, or any number of other situations. The key is, would a reasonable person see your life at risk in this particular situation? This would justify the use of lethal force.