Here is another great shop to keep in mind guys !
Autohaus Frankfurt www.autohausfrankfurt.com
Located in Murrieta, CA
They perform all factory repairs. They are a Dinan authorized dealer, factory tools and equipment. Family owned business. Great place for all your german car needs.
I've had them do all my coding and installed my supercharger, brembo brakes, and many other services. Great shop !
Ask for Erik and reference this forum, he will get you a discount.