The Bugatti Type 51 Dubos Coupe is a one-off automobile originally built by Bugatti in 1931 as an open-top Bugatti Type 51 race car that was driven by legendary racer Louis Chiron, and then modified by Louis Dubos to be a luxury road coupe. It is one of the most valuable cars in the world, estimated at around $20 million dollars as of 2023.