I was watching Top Gear and they were talking about how there were no CGI effects used as far as the cars go.
So everytime they flipped, rolled, or otherwise wrecked a car they actually did that stunt with a car.
Not to say it was the real car, they were replicas in the action shots. They said at one point a Koenigsegg flips around and explodes, that's a million dollar car, but instead they used a replica, but said replica still costs them around $200,000.
They said they wanted to make a movie that was more like older car related action movies like The French Connection, Bullit, Blues Bros., and Smokey and the Bandit, where there were no special effects available.