AEM 21-514P: Air Intake Honda S2000 2.2L L4 F/I 04-05, Cold Air Intake System (21-514P) by AEM. To deliver cooler air to the engine, this air intake system places the air filter outside the engine compartment. Cooler air is denser than warm air and so contains more oxygen, which results in better combustion and more power. Installation time - 2 hours. Street legal in all US states.