Posting on behalf of Carlos G., region exec. of the Southwest SERCA club:

http://www.gfos.net/serca/2003/streets/reg.php

These are the same guys from the Nissan vs. Honda shootout on TNN a while ago. All cars welcome, and you don't even have to drive an SER or Nissan to become a SERCA member, which will lower the entry fee for all events for one year.