Harrison Motorsports in Alpharetta, the owner is a supporter of the local BMWCCA and is a good guy. I recommend them. 866.795.2002
EIS European Import Specialties, just off 41 on Airport Industrial Pkwy. Kelly works the front and Justin is the owner\mech. Very very good people ...OH...Justin also has a bugeye
where do you live. my friend owns Quantum Mechanics in Decatur. he's a great guy to know. he use to be a fly in tech for a Porsche racing team. they specialize in German makes and Volvo. http://www.quantummechanicsauto.com/
My boss uses German Autowerks right off Peachtree Industrial for his 5-Series. Seem like nice an knowledgeable fellows. http://german-autowerks.net/