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Whenever you baffle sound you are effecting the airflow. It may not be significant but it does lower some power by having the resonator there. If it didn't then half of performance CAIs would have them too.
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Right, I didn't disagree that it added 3-5 or any power. But the power that it adds is low enough that its not something noticeable physically and I doubt there is an intake only dyno, not to mention a resonator delete dyno. They add power, thats a fact, just not something that you are going to feel and go 'damn'.