Hey guys...I've been monitoring this thread for quite a while...trolling may be a better description...anyway...I have a 2007 Porsche Cayman S...I installed the avic z120bt unit myself. I bought an adapter that allowed me to leverage the silly Bose, optical factory amp and speakers set up to boot...anyway, i tried a ton of install positions for the mic....the one that finally worked was on the turn signal stalk to the immediate left of my steering wheel. I'm guessing that the head unit lends itself to a certain level of interference...Cripes, I have 2 mics on order and have already purchased