 March also fielded prototypes, with Al Holbert winning the 1983 championship with a Chevrolet powered car, changing to Porsche power later in the season; and Randy Lanier a year later with Chevrolet power.1984 also saw the introduction of the Porsche 962, which dominated the series from '85 to '87.Nissan then took control of the series in 1988, but faced challenges from Jaguar, Porsche, and Toyota throughout the next three years.