In the process of changing my CCV vent hose, which in return resulted in my hands looking like they were tossed through cheese graters, I so conveniently happened to knocked off what I found out to be the Final Drive (front axle) ventilation pipe.
I can't find exactly where its supposed to go. I think I found the bottom end connection, but don't know about the top. Does this really matter if its on or not?
its part number 31501428849
#1 in the pic

RealOEM.com * BMW E53 X5 3.0i Final drive(frnt axle),ventilat./4-wheel