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For specifics, pictures of the engine and the method of testing and dyno used for the tests go to the "Engine" section of the 1960 Roadster GT. The "WAR 4:1 *" test was done with the addition of our 5" Weber 44 IDF Aluminum Air Horns and our 5.25" Power Pulley. The dramatic increase in HP and Torque is mostly due to the tuning effect of the Air Horns. A small sacrifice between 4000 and 4400 rpm is made to achieve a large gain above 4500.