With a properly designed air intake resonator, it is suppose to help you dampen the pressure wave harmonics when the intake valve closes -- that is its primary job. If you remove it, you would likely hamper the effectiveness of your entire air intake system by resulting in some worse airflow.
Long story short -- I wouldn't take it out unless I am replacing it with a known aftermarket part that has been tested to show overall improvement in flow and hp/tq numbers.
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