First timers are not allowed to take passengers until approved by me. (depends on skill level, etc)
There are plenty of experienced autocrossers who are happy to give passenger rides, and also available to give free instruction!
Don't worry about car classes or anything like that, as non-Porsches are not included in our classing system.
The ONLY thing I ask, is that you do not come out if you have an excessively loud exhaust, or if you are going to be driving like a jerk on the roads around the airport!!!