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the many empty spaces in the intake are resonator tubes designed to quite down the noise of sucking air into the engine the more you remove before the air flow meter the more sound of air you hear entering the engine, the cold air intake is designed to smooth out the air flow and allow more unrestricted air into the engine to produce more power. same with the exhaust.

this can answer it better that i can explain..
http://auto.howstuffworks.com/engine7.htm
 
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