A bazzillion. The definition would be to isolate the BMW classifications and go from there. Lemme see if I can generate that. This pdf (see link below) did not render correctly (prolly pulled from excel) pages 2-3 have the BMWs and 20-21 have the classes. I sent a note advising them of this. http://scca.cdn.racersites.com/prod/assets/2013 Stock by manufacturer.pdf I just printed and taped it together and they do match. There are some gaps that us BMW folks could clarify. Please note this is stock classes. Some of the non-eligible go to higher prep classes (this was done when they were first introduced and as time has moved on they could be classed in stock classes if requested. The Z8 and '95 M3 Lightwieght as good examples.).