Jalopnik went on set of Fast and Furious 4 and checked out some of the movie cars.
After watching the Grand National abuse in pre-film teasers we're happy to report they did not, in fact, destroy any real GNXs. These cars are merely clones. As you can see in the photos above, there are multiples of most of the character cars. This includes the Brian's R34 Skyline GT-R, which has a 240SX-based clone seen next to the GT in the gallery. Why accidentally destroy a real R34 when you can destroy a fake one?