They both vent air to alleviate compressor surge. Yoru car already has recircs. which means that it takes the already metered air and allows it to recirculated through your intake system instead of throw it out like BOVs.BOVs normally let that air vent to atmosphere. It sounds nice and cool(if you get a non-ricey one), but can hurt your gas mileage. Unless your running high boost levels you dont need to worry about replacing them and its IMO a waste of money if unless you are producing alot of boost. Stay stock Later Josh
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