Vented BOVs are annoying... mine is REALLY bad now.

http://94tsiawd.com/Pictures/tialbov.jpg

That is a Tial BOV. Looks like it's on a small pipe, right? Wrong. That is 2.5" pipe. My turbo spools slow as hell, but, my BOV still opens when I let off the throttle VERY often. Pretty much every time.