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I have one (for sell have not posted this yet) as do many on this forum and other forums. It depends on what you want and where you plan on taking the car, it does make noise for all the fanboys. I recently changed to a HKS v4 and this still might not be the correct one if I go for some more pressure with a new turbo.

A couple of threads you might want to read that discuss the issue, remember the search tool, here and elsewhere is your friend.

BOV/BPV Thread - Mazdaspeed Forums

Discussion on how bypass valves can affect LTFTs. - Mazdaspeed Forums
 
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