I have a Blitz BOV copy, believe it came from SSAutoshit. I've used it on my d-series turbo and it was worked flawlessly for the past 2 months. It's actually a very quality piece and it has a very quiet woosh sound, identical to the real Blitz BOV. It's adjustable as well.
I dont have a camera on me right now, but it's in perfect shape. These go on ebay for ATLEAST $90 shipped.

$60 shipped

 

bumppp

 

up

 

no one wants a BLITZZZZZZZZZZZ :1