I will do the installation on Thursday (my weekend)... and yes, I will do it myself for the first time in my life
I spoke to a lot of car audio technicians here but unfortunately they are all "scared" to touch the BMW OEM audio system. They refused to do it!
The enclosure will be ready by tomorrow. I will post pics as soon as I have it and the fit is OK.
I already have the speaker wires for amp speaker level input and for the sub output. I will get a good power and ground cables from Raidoshack and I also have the crimp and snap connector to tap on the OEM wires. It looks like this:
This article is very useful:
http://www.xoutpost.com/articles/x5/s...ctory-amp.html