'91 200q turbo bypass valve in's and out's

[mallick@NetHeaven.com (John and Barbara Mallick)]

I was looking under the hood of a friend's '91 200q and noticed that his
turbo bypass valve had the input and output ports reversed from mine.  Now I
am wondering whose installation is correct.

The bypass valve looks like a little cylinder, with a manifold/vacuum port
on one end of the cylinder and a hose connection on the other end.  Off the
side of the cylinder is another hose connection.  On my car, the hose
connection off the side goes to the high pressure (turbo out) hose, while
the connection opposite the vacuum port goes to the input side of the turbo.
On my friend's car, it's just the opposite.  

Based upon how I see the valve operating, it seems like my connection is
correct, since under turbo pressure it would tend to keep the valve closed.
If you reverse the connections, turbo pressure would open the valve unless
there is enough positive pressure from the manifold/vacuum port to keep it
closed.  Neither of us wants to lose boost.  My connection also seems to
match the schematic in my Bentley manuals.  But you never know.

So what's the net.wisdom out there?  Is my turbo bypass valve installed
bass-ackwards, or is my buddy's wrong?

TIA

John Mallick 
'91 200q
'84 4000sq (dead master cylinder...any good offers?)