Backpressure usually refers to the
pressure exerted on a moving
fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. For example, an automotive exhaust
muffler with a particularly high number of twists, bends, turns and right angles could be described as having particularly high backpressure
[1]. Back pressure in the exhaust sense of the term, is usually termed as being a "bad thing" for performance; however, in the interest of reducing exhaust sound to levels allowable by public noise ordinances, back pressure can be regulated using systems from simple
butterfly valves to fully computer controlled units sensing pressure in the exhaust pipe itself.
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