January 12, 1991: In Detroit, Michigan, the North American International Auto Show is held, over nine days. American Sunroof Corporation and Don Runkle, General Motors' chief of advanced engineering, unveil the Corvette ZR-1 Spyder, a prototype convertible ZR-1.

This car was a joint project with General Motors Advanced Engineering Staff (AES) and American Sunroof Corporation (ASC). The vehicle was produced at the CPC Bowling Green plant and the signatures of those involved in the project are on the underside of the hood and rear deck lid.

The ZR-1 Spyder features unique hood and quarter panel vents to aid in engine compartment cooling. A new tonneau cover flows from the rear deck lid into the passengers compartment, reflective of Corvettes from the late 50's and early 60's. Individual aero bars are integrated into the body work behind the seat. The windshield and sideglass have been lowered, accenting the "slingshot" design treatment.