Removing muffler from 2005 Hyundai Sonata

Will removing muffler rob gas mileage

Why do you want to remove the muffler . . . ?

If it’s rotted out, just go to a reputable independent muffler shop and have them weld in a new one

Rob gas mileage , No but it will get you a fine for noise and really annoy your neighbors.

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No way to tell what it will do to gas mileage in advance. Just nosy, but why on earth would you want to do this?