The movie start Bruce Willis is putting his customized collection of muscle cars up for auction this weekend at Petersen Automotive Museum in Los Angeles. The car list includes: a 1968 Shelby GT500, a 1968 Pontiac Firebird 400, and a 1957 Chevrolet Corvette. The trio are on display all week at the museum in advance of the sale.The auction will also include memorabilia from the family of Steve McQueen: photos, movie posters and other personal effects, come from the collection of McQueen’s first wife, Neile McQueen Toffel.