Agreed. If they did it would discriminate both ways like someone said before about the performance 6's and against things like the smart car. That'd be funny, you take off at the lights, barely catching up to the push bike next to you in a smart car. Get pulled over by the cop saying: "You are driving a prohibited performance vehicle, sir, step out of the car. I am giving you a fine."
Just kidding, i know those smart things go quite alright.