well your right about one thing shov. a resonator too close is bad, but a resonator further down stream is not, where it helps create a negative pressure zone. You would also want it as far away from the originating source anyway to help dissipate the sound waves before they even GET to the resonators for frequency cancel. So I see no reason at all why it would rob power unless its improperly designed with too little flow, too little velocity, or improperly shaped entry and exit to the resonating chamber that causes turbulence. I would like to see something to back that claim up, as in my personal experience thats just not true. cats sure, resonators, no.
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