i believe members of sccv website/forum. I paid 40 without thinking of signing up for their forums.Try signing up for their forums and see if that counts for a membership.
I have now signed up and I know you can enter in the Novice class if you want (up to 10 times) before you have to go to your class, class2 is all mustangs besides the cobras. I like how the 97GT is the same as the 03 Mach 1 in their eyes, lol.
A few people from my car club at my college are going, should be a fun time.