Define 'group'.
The BMW CCA is well established, and there are plenty of Motorsport oriented groups around (or at least I've HEARD that there are in the northern Cali area...I live in SD). If you can't find what you're looking for with the BMW CCA folks and there isn't enough like minded people in this West forum near you, try taking a peak at the Cali section of bimmerforums.com as well. Just don't stay too long, DTM is where it's at.

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