Not sure about the stock Airbox, but the current set up uses the stock BPV. You can get any BOV flange put on, you just have to ask Corksport.
All so see this thread.
http://www.mazdas247.com/forum/showthread.php?t=120638&page=5
All so see this thread.
http://www.mazdas247.com/forum/showthread.php?t=120638&page=5