Bodywork and chassis components may be replaced or modified, with the following restrictions:

1. Bodywork must bear a noticeable resemblance to production counterparts.

2. Polycarbonate windows are allowed, with the following restrictions:

A. Rear, door, vent and quarter window glass can be replaced with a clear polycarbonate material having a minimum thickness of 3 mm. The windows in the rear door of a four-door car and quarter windows can be run in their stock open or closed position. Ducts can be installed in the door, vent and quarter windows or resultant door window openings, for the sole purpose of supplying cooling air to the driver.

B. If the windshield is replaced, the replacement must be of a polycarbonate material with a minimum thickness of 6 mm, be identical in size and curvature to the stock glass windshield and have a minimum of three (3) vertical inner supports to prevent the windshield from collapsing inward. Inner windshield supports must be a minimum of 0.75 inch by 0.125 inch straps of aluminum. The inner supports must be mounted a minimum of 8 inches apart.