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How does my exhaust system work?
The way a silencer works is quite fascinating. It contains a deceptively simple set of tubes that are finely tuned to reflect the sound waves produced by an engine so that they cancel each other out.
http://auto.howstuffworks.com/muffler1.htm
Useless fact of the day:
It's not gmail.com anymore it's googlemail.com if you live in the uk...
Some other firm registered the name before Google, went to court and Google lost.