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Originally Posted by Gerardo de Kort
Never cared for checking but do you know if they make quiet BOVs?
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Sure, the stock BOV on my '01 WRX was quiet. Rather than blowing air off to atmosphere it would recirculate it around to the inlet before the turbo. If I recall currectly this helped to keep the turbo spinning too.
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Originally Posted by eric95
I guess when the throttle plate slams shut the air gets fired out the air filter?
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The idea of a BOV is relieve pressure when you lift off the throttle so that the turbo keeps spinning rather than stalling as pressure builds for a second. It also keeps things from going over pressure when you lift - which might cause an intercooler or piping to break. I doubt you'd have pressure going back out the air filter, as to do that you'd have to get the turbo spinning backwards or something...