One of more interesting time periods for Corvette came midway through the C4 production run when you could order a twin-turbo for your Corvette. In 1991, the B2K twin-turbo RPO was the only non-GM performance option that could be ordered on a Corvette. This limited edition 1991 Series 1 Corvette Callaway Speedster is #8 of 10 made and used to be part of the Otis Chandler collection before being acquired by Chevrolet dealer and Corvette collector Bob McDorman.