Need some help deciding in which class your car belongs? The SCCA Solo Rules Handbook describes each class as well as the modifications that are allowed for your class. The SCCA may have updates within the year to clarify what mods are allowed. Many other rules for the sport are also covered. Try this Link:
Street category vehicles are any that have been in series production within the US in the last 30 years and asides from what is allowed in the rules must be factory stock. This is a good starting place if your car is factory stock.
Typical mods may include:
Street touring class caters to folks who have modified there cars and have allowances for braking, suspension and wheel modifications.
Typical mods may include:
Street Prepared cars build on the modifications allowed in Street Touring with additional allowances for drivetrain modifications and aero allowances.
Typical mods may include:
Street Modified allows for some of the more extremely modified cars with allowances for engine modifications. These will be some of the most modified cars you'll see that are still able to be street driven.
Typical mods may include:
Prepared vehicles use the body of a production vehicle and most are usually dedicated track/race cars.
Typical mods may include:
Modified vehicles are full on racecars including, but not limited to custom built chassis.
Solo Spec Coupe is a spec class for all 2013-2016 FR-S/BRZ cars. This class was created to provide a middle ground between the Street and Street Touring category. Modifications are limited to specified parts to keep costs down and provide a level playing ground.
The Classic American Muscle category is designed for any North American front engined, rear wheel drive car. The ruleset is fairly open to encourage muscle car and pro-touring enthusiasts to participate in autocross.
