two years before Chevrolet had to terminate the series due to astronomical costs. Fortunately, in 1990 the SCCA revised the Escort Endurance Showroom Stock series into the Escort World Challenge, and the C4 Corvette was allowed back in to compete against the Lotus Esprit Turbo, Mazda RX7 Turbo and Porsche 944 Turbo.
    Chevrolet offered to help the established Corvette teams get into the World Challenge by building a small batch of specially prepared cars. Marketing code R9G delivered a Corvette stripped of most frills but packed with much of the