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BMW CCA is a great place to start. I've been autox'ing with them for a couple years in my old E36. Quite a few minis out there, and they have a classification system for them also. Check out their website www.ggcbmwcca.org
Best thing about living here in the bay area during the peak autox season you can be racing every weekend
Sfrscca.org
Aas (American autox)
NorCal ufo
Bmwcca
Lotus club