1. No portion of the vehicle or bodywork (other than exhaust/exhaust hangers) may be less than 3 inches from the ground.

2. Body panels may be modified or replaced in the original standard locations. Frame or Unibody may only be modified the minimal amount to account for allowed modifications. Subframes may be replaced or modified.

3. Body panels may be attached with removable fasteners (e.g., Dzus®).

4. “Side Skirts” sometimes referred to as “barge boards” may be added with the following restrictions:

A. No portion of the side skirts/barge boards may be less than 3 inches from the ground.

B. Horizontal portions of a side-skirt/barge-board may not extend more than 3-inches from OE bodywork when viewed from above.

C. They may not extend further than 12” inboard from the outer limits of OE bodywork.

5. Fenders and running boards may be removed from vehicles with a production year prior to 1946, as long as the removal of those parts does not expose the interior of the car or engine compartment.

6. Vehicles prepared to safety level 3 may substitute glass windows located behind the drivers seat with alternates made of transparent polycarbonate material with a thickness of at least 3mm. This includes the rear windows in a 4-door car, vent and quarter windows, and the rear window. Size, shape and location must be the same as factory. Alternate windows must be securely fastened to the vehicle. Rear window safety straps are highly recommended.