some more info:
guy talkin about switching from stock to this one on his dsm:
http://herpetology.com/dsm/bov.html
The small hose you removed from the stock BOV must be connected to the larger nipple on the anodized cap (closest to the adjustment screw.)
(Note: This connects to the intake after the throttle butterfly and will pull vacuum when the throttle is closed)
The smaller nipple on the cast aluminum body of the BOV may be spliced into the turbo outlet pipe or into the line between the turbo and wastgate actuator. Use the T-connector supplied. This connects to pressure even when the other line has vacuum. This will activate the BOV faster by applying pressure under the valve seat.
The smaller nipple may also be left unconnected. The BOV will operate slower and more quietly. I did not test this mode.
Replace the air return tube so metered air may be restored to the turbo intake. I had some trouble with fitment so I added some tape to the connection between BOV/tube. I also pulled up the neoprene hose cover that was found lower on that hose, so it covers and reinforces the return air connection.
Some may allow the BOV to dump into the engine bay to increase the sound but there are reports of air/fuel ratio problems with that approach.
I find the sound is certainly loud enough with the return hose connected.
The adjustment screw may be tuned for a harder or softer operation if both hoses are employed. There is nothing to adjust if you do not use the second turbo pressure line.
since that seems to be the point of discussion/confusion