The NOV distinction is for Novice, but that is in addition to the actual classification of the car. The cars running with the NOV group compete against each other using the PAX system so, a newbie in a Camaro and another in a Civic can compete against one another. Beware of modifications that put you above and beyond how competitive your car can be, that is, if your goal is to be competitive. If your goals for autocross are to test your car out in a controlled area, and build the car the way you want it, then by all means, don't let classifications come into play. I can tell you from experience, that it is more fun to have a car that's competitive for the class and take home trophies from time to time.