I'll add two for the southside of Atlanta:

Allspeed Autoworks, Peachtree City, 770-631-3966. A nice BMW/Porsche performance shop, with high-end alignment equipment. They did a reasonably priced front bearing replacement for me and some a/c work.

Fayette Imports, Fayetteville, on GA 85 north of town. Good, reasonable, all around quality shop for M-B and BMW work. Good to work with if you want to buy parts for their install; I believe they have the BG flush equipment, among other services.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.