· Exhaust mufflers：A mufflers is a soundproofing device that reduces the sound of the engine utilizing acoustic sound muffling. Made up of two chambers and pipes, with holes in them, that can produce a wave that removes certain sound frequencies. The exhaust gases, along with the sound waves, enter the center tube and bounce off the rear wall of the muffler and are reproduced through a hole within the main body of the muffler. Lastly, they pass through a set of holes into a second chamber, where they are then released through the last pipe and out of the muffler, entirely.
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