1. Non-standard brake rotors may be used provided they are of equal or larger dimensions. Nominal reductions in rotor thickness or diameter in common big brake kits are permitted.

2. Aluminum rotor hats are allowed.

3. Cars originally equipped with solid (non-vented) rotors may utilize vented rotors.

4. Brake calipers and mounting brackets may be replaced provided they bolt to the standard locations and the number of or surface area of pistons is equal to or greater than standard. A functioning emergency brake of the same type, operation, and actuation as OE must be present. Drum brakes may be replaced with disc brakes of a diameter equal to or greater than the inside diameter of the standard drum. Such conversions must be bolted, not welded, to the axle/trailing arm/upright and must include an integral, redundant emergency brake. Changes to backing plates/dust shields/brake lines to accommodate these changes are permitted but may serve no other purpose.

5. Air ducts may be fitted to the brakes and changes may be made in the body/structure for their use. Ducts or holes may serve no other purpose. Backing plates and dirt shields may be modified or removed.

6. A single brake master cylinder brace may be added provided it is bolt-on and serves no other purpose.