I'm expired and Memphis cops have never said a word about it.
I have been run many, many times and the only one who tried to give me a hard time only complained about no lights.
I bought a red flasher for the back.
As long as it's under 50cc they don't care. My eyes are pretty bad so the 66cc's look like 50cc to me.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.