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Mufflers are typically installed along the exhaust pipe of the engine. They usually contain a series of baffles to absorb sound, although the majority of the noise reduction is not through absorption but through destructive interference in the muffler itself. The muffler accomplishes this with a resonating chamber, which is specifically designed such that opposite sound waves are likely to collide, canceling each other out. They are a common piece of equipment on automobiles, usually slung under the rear of a car, but many diesel-powered semi trucks have large mufflers mounted vertically behind the cab.

Magnaflow Muffler
Magnaflow Muffler  5" Round Center/Center Polished Stainless Steel Universal Muffler.
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