Exhaust silencers typically reduce the performance of your car by a little. Removing exhaust silencers through “muffler delete” can gain you 5-10 horsepower. As for gas mileage, exhaust silencers do not impact gas mileage enough for it to be noticeable. Exhaust silencers do add some backpressure that could theoretically reduce…

Ifandi L.July 10, 2021