1994 Chevrolet Corvette Convertible (C4). The C4 Corvette was known for its evolved. sleek and modern look. In a departure from the fiberglass panels of its forebearers. the C4's rear bumpers and panels were made from molding plastics. a sheet molding compound. The Corvette C4 came standard with an electronic dashboard with a digital liquid crystal display dash. with graphics for speed and RPM and digital displays for other important engine functions. The C4 represented a clean break from the previous generation of Corvette with a completely new chassis and modern. sleeker styling.