All Koenigsegg cars are powered by the DOHC 4v/cyl V8 engine found in the previous-generation Ford Mustang, albeit completely rebuilt from the ground up using new components; the CCRs powerplant measures 4.7 liters in displacement, and is boosted by two small Rotrex superchargers. To meet the outlying goals, the North American-bound CCX features new cylinder heads with larger valves for greater airflow, dual fuel injectors per cylinder, a new camshaft, and a new engine management system with different engine timing. Koenigsegg also fitted a new exhaust system with catalytic converters that have been placed closer to the engine for an earlier light-off time. To comply with the lower octane fuel, the engine was fitted with a unique combustion cooling system, which drops the combustion temperature significantly, allowing the engine to run on 91-octane gasoline thereby preventing the pre-detonation of the gasoline-air mixture which would otherwise result in serious power loss. As a result of these changes, the car has no loss of power compared to the European CCR, maintaining the 806-hp and 678 lb-ft of torque ratings.