The valve that started it all. Worxs WRX and STi compatible valve is rapidly proving itself to be the best BOV available for WRX applications. The valve offers lightning fast response with the precision of a surgical instrument, and some of the finest CNC Machine work you will ever see. The patent pending valve design offers the proper air return needed by your Subarus air flow metered fuel injection system, but also features a controlled atmosphere vent which can be run closed, or in four stages of vent. Additionally, the staged design makes the rate of atmosphere vent variable depending on boost pressure at time of release. The Worx DualStage valve offers performance valve benefits, without sacrificing daily drivability Available in Anodized Red, Cobalt Blue, Gunmetal, and Fully Polished.