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 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. 
The all-new, seventh-generation 2014 Corvette Stingray served as the Indianapolis 500 Pace Car, leading the field to green at the start of the 97th running of “The Greatest Spectacle in Racing,” on Sunday, May 26 2013. It marked a record 12th time the Corvette served as the Pace Car, starting in 1978. Jim Harbaugh, head coach of the NFL’s San Francisco 49ers, drove the all-new 2014 Chevrolet Corvette Stingray Pace Car