I searched, but didnt really come up with a straight answer. When I build up boost and release off the throttle, there is a flapping sound. Where is this pressure being released from, the bpv? I just listen to some audio clips of supras, but they always have the woosh and I just have a flutter. One thing to consider would be that the line that is suppose to go to my boost gauge has nothing on the end (its not attached to the gauge). I'm not in the same city as my car so I cant just go out and attach it, and when I was by it the other weekend, I didnt have my boost gauge. So is that a pretty big boost leak that could be causing the sound?