How Mufflers Work - Auto | HowStuffWorks

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HowStuffWorks Auto Under the Hood Exhaust & Emissions How Mufflers Work NEXT PAGE By: Karim Nice
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Mufflers cancel out most of an engine's noise.

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­If you've ever heard a car engine running without a muffler, you know what a huge difference a muffler can make to the noise level. Inside a muffler, you'll find a deceptively simple set of tubes with some holes in them. These tubes and chambers are actuall­y as finely tuned as a musical instrument. They are designed to reflect the sound waves produced by the engine in such a way that they partially cancel themselves out.

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Mufflers use some pretty neat technology to cancel out the noise. In this article, we'll take a look inside a real car muffler and learn about the principles that make it work.

But first, we need to know a little about sound. 

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Copy Karim Nice "How Mufflers Work" 19 February 2001.HowStuffWorks.com. <https://auto.howstuffworks.com/muffler.htm> 18 March 2026 Close Print | Citation More Awesome Stuff

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