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Old 05-13-2013, 09:16 AM   #435
Scooby Specialist
Member#: 284420
Join Date: Jun 2011
Chapter/Region: SWIC
Location: Lakewood, Ca
2011 WRX Sedan


The stock valve on our cars is a recirculating valve not a bov the only reason to get a new recirc valve is if yours is leaking. Bov's release the air into the atmosphere, this air has already been "seen" by the mass air flow sensor and your ecu has determined the fuel needed for that amount of air. Therefore when the air is released instead of recirculated, your car will run slightly rich. Please Google if you need more info, unibombers manifesto probably has bov info in it as well.
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