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Combining the best performance attributes of the record-setting, street-legal Dodge Viper American Club Racer (ACR) and the safety equipment of championship-winning Dodge Viper Competition Coupe, the Viper ACR-X is powered by the SRT-developed 8.4-liter V-10 engine, equipped with factory headers and a low-restriction exhaust system that produces 640 horsepower (40 more than the production model) and 605 lb.-ft. of torque (45 more than the production model).