I found these guy on Craigslist advertising BMW services. You'll need to call about exhaust. I've had them change my oil fot $110. Good quick service. They claim to have the lowest prices in the bay area.

http://www.autotechnicainc.com/services.asp

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'10 X6 5.0i with 7RR Performance Package
'04 X5 4.4i with staggered 20" #168