In addition to the normal classes, the local SFR region offers some local-only classes. You’ll notice a lot of “Indexed” Classes. The reason for this is to create a more competitive environment. Rather than have lower attended classes, it creates a large field of people to compete against each other.
N, NS – Novice and Novice Street
These are both index classes for people new to auto-x. If you run even once in this class during a season, you can’t run it again in the next season; you’ll need to run in a normal open class.
Novice is meant as an index class for any car that would normally fall into a non-Street class. So any Street Prepared, Street Modified, Mod, etc. car would go here.
Novice Street is an index class for any car that would run in Street or Street Touring. These are cars that would normally run in things like STU, STX, STF, AS, etc.
Both of these classes require that you use 200+ treadwear tires.
CAM – Classic American Muscle Indexed Class
The CAM- indexed class contains: CAM-C, CAM-S, and CAM-T.
OSP – Open Street Prepared
This is a catch-all style class. There are only two real rules: car must’ve been registered for legal road use at some point, and the tires must be D.O.T. legal. For more specifics, please see the Supplemental Regulations.
P- Prepared Indexed Class
The P- class is an indexed class that groups together the classes: BP, CP, DP, EP, FP, XP.
SM – Street Modified Indexed Class
The SM- class is an indexed class that groups together the classes: Street Modified (SM), Street Modified FWD (SMF), and Super Street Modified (SSM).
SP – Street Prepared Indexed Class
The SP- class groups together the classes: ASP, BSP, CSP, DSP, ESP, FSP, OSP.
T2 – Street Tire Indexed Class
The T2 class is an index class designedfor Street Prepared and Street Modified type cars who want to run on street tires with 200+ treadwear. For more specifics, please see the Supplemental Regulations.
X – Indexed
The ultimate competition class, indexed. All cars can run here in their full prep and compete for the best indexed time.