It just gets noisier in most cases. If the resonator is an actual restriction in the pipe, it could potentially increase your fuel economy, depending on how you drive. If you drive like a "normal" person, it probably will, because you're probably working the throttle quite heavily. If you drive like most of us do, no chance.
I think that little point is where alot of discussions get out of hand on whether or not something will improve MPG...
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