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exhaust valve - a valve through which burned gases from a cylinder escape into the exhaust manifold. exhaust system, exhaust - system consisting of the parts of an engine through which burned gases or steam are discharged. valve - control consisting of a mechanical device for controlling the flow of a fluid.
How an Exhaust Cutout Works. An Exhaust Cutout is really a Y pipe that is welded into the stock exhaust pipe. One of the Yâs legs continues on the exhaust as normal while the other Y leg can be vented to the atmosphere.