Wings, wing endplates, spoilers, canards and splitters may be added, removed, or modified with the following restrictions.

1. A rear wing may be added, removed, or modified with the following restrictions:

A. May not be added in addition to an OE wing.

B. Only one wing may be added.

C. The total surface area of rear wings shall not exceed 8.0 sq. ft. as calculated by multiplying the maximum chord by the maximum span. Definitions of the element (camber) and angle of attack when mounted on the vehicle will not affect the area measurement. The area for multiple element wings will be the sum of the individual areas of each of the elements.

D. The number of wing elements is limited to two (2).

E. Except for standard parts, wings designed to be adjustable while the car is in motion must be locked in a single position.

F. Wings, and any component thereof, may not extend beyond the OE vehicle width as defined by the outermost portion of the OE bodywork Including mirrors, door handles, rub strips and trim.

G. No portion of the wing or its components (including endplates and mounts) may be more than 6 inches (15.24 cm) forward of the rear axle, more than 6 inches (15.24 cm) beyond the rearmost portion of the bodywork, and have the following restrictions on height:

1. On sedans/coupes/trucks the wing may not be more than 10 inches (25.4 cm) above the roofline of the vehicle. For convertibles/roadsters with no roof and targas with no rear window, the windshield frame, or windshield of any material shall be considered the top of the roofline.

2. On hatchbacks/wagons/Sport Utility Vehicles, the wing may not be more than 14 inches (35.56 cm) above the roofline of the vehicle.

H. Reinforcements to the wing mounting area may be used but may serve no other purpose.

I. All commercially available wings, splitters, air dams, and diffusers that are vehicle model specific and installed per the manufacturer’s directions are permitted with the following exclusions:

*There are currently no excluded products

J. Aftermarket spoilers and aftermarket rear wings are mutually exclusive such that a builder may add one or the other, but not both.

2. A spoiler may be added to the rear of the car provided it complies with the following:

A. The spoiler may extend no more than 10 inches (254 mm) from the original bodywork in any direction.

B. Aftermarket spoilers and aftermarket rear wings are mutually exclusive such that a builder may add one or the other, but not both.

3. Canards are allowed with the following restrictions.

A. Canards may not extend beyond the OE vehicle width as defined by the outermost portion of the OE bodywork including mirrors, door handles, rub strips and trim.

4. A front spoiler/air dam/splitter is permitted, with the following restrictions.

A. A front splitter, air dam, spoiler, and vertical members (e.g., fences, endplates) may be added below the top of the bumper. Components may extend a maximum of 6.0” (152.4 mm) from the front bodywork/fascia as viewed from above.

B. Splitters may not extend rearward past the vertical centerline of the front wheels.

C. OE (factory) front spoiler/splitters are permitted, and if mounted in the stock location, have no height restrictions.

5. Diffusers are allowed with the following restrictions:

A. May not extend forward past the vertical centerline of the rear wheels.

B. May not extend more than 6” from the rear bodywork, as viewed from above.

C. OE (factory) front diffusers are permitted.

All aerodynamic modifications are subject to technical and/or safety inspections by Event Officials.