In Cali, probably a fix-it ticket, if you are not breaking any other laws and have not given the finger

If driving to a night time drag race on public roads, major bust. Cars rarely come out of impound in the state
they went in
High performance non-DOT tires degrade after allot of heating cycles so at some point there is no point.
Their construction is not as robust, this helps them run cooler but they are more susceptible to road hazards.
In my reading about Auto-Cross, many tow a small trailer behind their car with a spare set of tires and tools.