If you've ever heard a car engine running without a muffler, you know the difference it makes to the noise level coming from your vehicle's exhaust system. The muffler is designed to reflect the sound waves produced by the engine in such a way that they partially cancel themselves out.
Where Does the Sound Come From?
Sound is a pressure wave formed from pulses of alternating high and low air pressure. These pulses make their way through the air at -- you guessed it – the speed of sound.
Source: http://www.excelautoandtire.com/tips-blog/exhaust-system-how-does-a-muffler-work
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