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I hear every one here say performance mods hurt FE.. Well i would think anything after the gas has been used to make less work for the motor would be beneficial to FE.. at that point its a waste product of the process.. get rid of it the easiest way you can.. In My Hyundai Accent I did a cat back exhaust with a flow master muffler and its didn't hurt gas mileage..and yes you can tell when your getting on the gas with louder exhaust..
It wasn't overly loud but you could hear it and when you got on it, it rapped a bit more.
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