A muffler is one component of the exhaust system and is used to reduce exhaust noise.
Because the exhaust gases discharged from the combustion chamber during the combustion process are discharged at the pressure of the gas itself, they are under a considerably high pressure which causes them to expand rapidly when released directly into the air via the exhaust pipe, in turn causing a loud noise to be generated.
To prevent this, the muffler converts exhaust gases into a smooth gas flow that is then released into the air, muffling any sound.

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