Jalopnik.com has a story by Matt Hardigree with photos of the original “Hover BMW” used by Griff Tannen in Back to the Future 2. Jeff Chabotte acquired the original BMW 633 used in the film and restored it to the very custom and futuristic look as seen in the movie.
The original story can be found in its entirety at Jalopnik.com (LINK):
The site includes many high resolution “before” and “after” photos of the prop car.
Jason De Bord