so i read on some forum somewhere that the stock wrx BPV had some sort of silencer that could be removed. lookingforsuby and I investigated and found nothing. but when we hooked up the valve, we decided to exclude the exit tube and see how she sounded......whoooosh. haha sounded real good but she didnt like it much and ran rich and stalled a couple times. so my exit tube is back on the BPV but boy was that couple minutes of driving real fun. just thought id share the story, cheers. ps i know why its running rich, yadda yadda metered air, reading it coming in, and not out yadda yadda so no one has to tell my why haha. but it was damn fun