My son has a 2001 s4 with nav. It does not have the round disc on the trunk lid as I had seen on an a6 with nav.(unknown year). Does anyone know if a 2001 a6 with nav.has this disc visible on the trunk lid? If it is not visible but concealed in the trunk lid, would the installation of a spoiler interfere with the signal to the nav.receiver?

<center><img src="http://andrew.688.com/images/gallery/2001/March/PostZaino/rear-side-M.JPG"></center><p>