The same way that a straight through muffler quiets down exhaust noise. The air flow through, the sound waves enter the holes, bounce around and cancel each other out. This resonation does not hurt airflow in itself, we see gains by removing it because they force the engine to breathe through a smaller hole.
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90 Eagle Talon Tsi AWD - 300 Hp -K&N, 16g turbo, JE pistons, 3in Turbo back exhaust, mild port&polish
03 PT Cruiser GT - 215 Hp-Airbox and Intake pipe silencers removed
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