Porsche 917/30. Its 5.4-litre twin turbo Flat-12 delivered up to 1,230hp in race trim, 1,580hp in quali trim. In race trim, 0 to 200 km/h takes 5.4s, hitting 300 km/h is done after 11s, and the car weighs 849kg. In 1973 Porsche wins all eight races (six with the 917/30) and the CanAm championship.