Editing Resonator (section)

===Automobiles===
[[File:Exhaust with Resonator.jpg|right|thumb|A sport motorcycle, equipped with exhaust resonator, designed for performance]]
The exhaust pipes in automobile [[exhaust system]]s are designed as acoustic resonators that work with the [[muffler]] to reduce noise, by making sound waves "cancel each other out".<ref>{{cite web|url=http://auto.howstuffworks.com/muffler4.htm|title=How Mufflers Work|date=19 February 2001|website=howstuffworks.com|access-date=7 May 2018|url-status=live|archive-url=http://archive.wikiwix.com/cache/20051008174400/http://auto.howstuffworks.com/muffler4.htm|archive-date=8 October 2005}}</ref> The "exhaust note" is an important feature for some vehicle owners, so both the original manufacturers and the [[aftermarket (automotive)|after-market suppliers]] use the resonator to enhance the sound.  In "[[tuned exhaust]]" systems designed for performance, the resonance of the exhaust pipes can also be used to remove combustion products from the combustion chamber at a particular engine speed or range of speeds.<ref>{{cite book|title=Advanced Automotive Technology|page=84|publisher=United States [[Office of Technology Assessment]]|date=September 1995|url=http://www.princeton.edu/~ota/disk1/1995/9514_n.html}}.</ref>