1956 Corvette SR2

designed for Bill Mitchell, and 3 were made. The first was test and eval, the 2nd was for Bill personally and to get some racing trophys, and he had Smokey Yunick prep and maintain it. So many parts were made from lighter weight stuff, that they shaved 700 pounds off the factory model

info and images from http://www.conceptcarz.com/vehicle/z15199/Chevrolet-Corvette-SR2.aspx