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Dump valves are fitted to the engines of turbo charged cars and sit between the turbo outlet and the throttle body. These are known for the "tissh" sound when you change gear.
Found already fitted in cars such as a subaru.
Dude i just bought i Subaru, i love the sound of the dump valve when i change gear. Listen it goes "Rummmm tissh!"
by KatieLovesIt! April 20, 2009
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