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There were several successful attempts to build a convertible ZR-1, most of them by private people. The DR-1 was a GM prototype to test the structural integrity of the ZR-1 chassis when it would be topless. The car was built by American Sunroof Corporation (ASC) for Don Runkle, who was the vice-president of Advanced Engineering Staff, which explains the “DR-1” designation. It was a standard convertible transformed to ZR-1 specs.
The Z06 Carbon was created to celebrate the 50th anniversary of the first appearance of the Corvette at the 24 Hours of Le Mans when John Fitch and Briggs Cunningham won their class and finished eighth overall. The Carbon edition is essentially a Z06 with a ZR1 chassis and some of the carbon skin. With only 500 examples made, this is one rare and special looking Vette. The limited edition is distinguished by an aggressive look and black accents, reminiscent of the Porsche 911 GTS range.
The early C4's had their problems, what with the 1984 Cross-Fire Injection and its unusual 4+3 manual transmission. By the late 1980's, the fourth-generation Corvette had evolved into a more desirable automobile, thanks in part to the arrival of the ZR-1.