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It's basically a sound reducing device. The US EPA and several other nations' regulator bodies require a 'pass through' noise test, as well as stationary noise requirements. Suzuki, and others, have found a way to pass these tests without significantly hurting performance by closing this exhaust chamber valve at strategic moments commensurate with test requirements.
To pass these tests without this type of valve would require a far more restrictive and power robbing exhaust system.
The sell this device to the consumer as a 'power enhancing feature' to discourage it's removal, or at least to discourage it's disdain.
In fact, it has been shown on the dyno that this type of obstruction in the exhaust collector does not enhance power, but does in fact diminish it to some degree.
If it was a true power enhancer, every racing motorcycle and every aftermarket pipe bender would have them installed on their equipment.
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