blow off valve
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Any bypass valve that vents into the atmosphere will be loud. Most stock bypass valves vent back into the intake manifold and makes a kind of whoosing noise rather than the bus-like psst you get from the atmospheric BOV's. The purpose of a bypass valve is not to increase horsepower, but to save the life of a turbo. Keep in mind that if you vent into the atmosphere instead of back into the intake manifold you might encounter idling problems.
2005 Mercedes-Benz C240 4Matic
1993 Mazda Rx-7 Twin Turbo (sold)
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