http://www.bimmerdoc.com/ http://www.bimrs.org/profiles/Masons.html http://www.bimrs.org/profiles/Barons.html
Check the SD BMW CCA website and also look in the Fahren Affairs newsletter, available online on the website.
Mason's, Baron's, Marco Polo, and everyone's favorite, Carl Nelson at La Jolla Independant. Find trustworthy places at BIMRS.ORG