I am trying to figure out where to put the controller unit in my 2006 4.8. In my last car (E55) it went in the ashtray so when I shut the ashtray it was completely concealed. Has anybody been able to do so in the X5 and if so can you describe and post pix as to what you cut to make it fit? In searching the boards I have found only the "knee board" install which is (i) too visible and (ii) too tough to put back to "stock" upon resale.