^ Sweet man, mine is on it's way...
If you disconnect your battery (or loose power for some strange reason) you will loose your RT map and the car will be well dead do to the anti theft....what if it happens when you don't have your AP on ya........
I'd wouldn't recommend it....flash stage 1 as the base, then if you are gonna leave your car and you are worried flash the Anti Theft - i only did that once when I left it at an airport.....