This install will get the Job done, but is a bit rough. I installed the M47 heads using all weather double sided tape. (heavy duty stuff, dont miss) I was able to get away fron the trunk install without any hardware and the heads cannot be removed by hand alone.
http://www.radardetector.net/forums/...2011-335i.html
You will need to join and post a few things to see the pix.