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First up was the earliest RPO 684 fuel-injected '57 Corvette known to have been produced. John and Sally Neas from Tulsa, Oklahoma, currently own this car. RPO 684 offered stiffer springs, bigger shocks, a fatter front antiroll bar, faster-ratio steering, bigger brakes, and a limited-slip differential. This car is considered to be one of the most successful B-Production racers of the '57 season.