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Just remember that you've got to live with the loudness once you get it. I went through a few BOV's on my WRX before finally settling on an APS 50/50 valve. I had a Greddy and the HKS SSQV as well. The HKS is definitely loud and it can get a bit annoying after a while. I liked the APS because if you drove it lightly, it recirc'd and you heard nothing, but if you got on it, you got the typical whoosh.
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