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If you title and register your kei car in washington (where you can register it, usually) and keep it and drive it in California (where you can't register it), there's a chance some officer who hates kei cars is going to find it and raise a stink. And then you've got to pay fines, and maybe your car gets towed and you have to flatbed it out of state. Plus fines, I'm sure.

If it's cheap enough or fun enough, it might be worth the risk; but I don't know that I would risk it.

I know someone who got pulled over, and then a ticket for driving in California with washington plates and changing 3 lanes at once. "Anybody who drives like that must live here"

Not sure what a kei car would be doing on a freeway 3 lanes over though.