Your car is flipped and predestinated to wreckage, but you want to prevent that? Insert CarUnflip.cs into your CLEO-folder, and that won´t (shouldn´t) happen any more!
Your car will only unflip with a speed less approx. 20 km/h (for the case you got in situations where your cars has to get flipped, e.g. alley oops). Additional, you´re also able to flip your car manually by pressing CTRL+R.