[Automatic 51]

from what i understand you seem to understand te classes good. ST is your basic bolt ons, intake, exhaust, strut and swaybars. brakes and pads can be changed but must be stock diameter and new wheels and tires are allowed but must have stock tranny and engine internals. STX adds LSD.

is SP you can add cams and other internals. along with larger brakes.

this is just what i understand the rules to be. i could be wrong. bassically ST is for the daily drivers who want to have some fun, and SP is a car that's street legal, but highly tuned. someone correct me if i'm wrong here. i'v eonly done 2 events so far but i'm really into it.