Have you tried a BMW forum? Probably your best bet if you're looking for exact wire routing and anything else vehicle specific. If you're using a stock deck with a LOC, you can probably do everything right inside the trunk.
I Posted a thread but this forum everyone replies so fast and its reliable because there's always debates and with debates it makes it easy to conclude whats best //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif all i really need is a few pics for the remote and rcas or whatever there is needed to be wired besides the ground and power!