In addition to the limited-edition Corvette Victory Edition, a second special version of our favorite all-American sports car was introduced in spring, the Corvette Competition. This model, built in limited numbers on the basis of the C6 Corvette, bears strong links to motor sport too, in which the Corvette has proven highly successful. The Corvette Competition was competitively priced and one heck of a package.
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 2019 Corvette ZR1 was the official Pace Car for the 2018 Indianapolis 500 presented by PennGrade Motor Oil and led drivers to the green flag on Sunday, May 27, for the 102nd running of the legendary race. It marks the 15th time a Corvette has served as the official Pace Car since 1978, and the 29th time a Chevrolet has led the field dating back to 1948, when a 1948 Fleetmaster Six convertible paced the race.