- Fully venting off to atmosphere (a.k.a SuperSonic)
- Fully recirculating like a diverter valve, except still make the sweet BOV sound (a.k.a PlumBack)
- Half & Half (a.k.a 50/50)
- 2008 - 2014 Subaru Impreza WRX (will not fit 2002 - 2007 WRX, please view our other listing for those years)
- 2005 - 2009 Subaru Legacy GT
These units are also adjustable by twisting the top cap clock-wise, and counter clock-wise to control the degree of vent off for fine tuning and getting the most out of the BOV based on any individual's preference.
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