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Auto manufacturers often times put baffles or mufflers in the OEM air cleaner and they are quite restrictive as well , that that makes them pretty quiet , aftermarket air cleaners emliminate such muffling devices and greatly increase the air flow volume and velocity and that is what causes the aftermarket air cleaner (refered to as a cold air intake or CAI) to make more noise , there is usually a noted whistle , this caused by the air passing over or past irregular shaped things in the intake or throttle body as well as air passing through the idle air control valve and throttle plates at idle and part throttle (it's more noticeable at part throttle because of the small opening that the air passes through just like when you have your window cracked and the air passing it sometimes makes a whistleing sound)

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13y ago

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