For those clubs that host autocrosses, how do you classify your cars? Do you go by SCCA Solo-II classifications, or do you do something else? I know some chapters have devised their own classification system. The Boston Chapter, for example, uses its own, based on chassis, engine, and uses a point system on top of that for mods. I participate in the NJ BMW CCA Chapter's autocrosses, and we use a variant of the Boston Chapter's rules. For non-BMWs, they're put into an X class, and we rely on the entrants to tell us their SCCA classification, and those results are all PAX'ed together. I'd be interested to know how everyone else does it.