No, there isn't. Modifications are limited to the laws. For example, the suspension CAN be modified (and it says that), but lift blocks aren't allowed on the front, cannot be raised more than something ike 24 or 28" (not sure....I drive a car), and cannot be lower than 14" from the middle of the bumper (unless there are Street Rod/Hot Rod Plates). Modifications are legal, but when you get to things like exhaust, it is up to the cop what is "unreasonable" because the law dosen't state a specification. Tint, suspension, and other things are legal...but to a certain extent, and the law states the limit.