In theory, yes. But, it's state-by-state, enforcement at drive-time is next to zero (unless the cop just wants to hassle you), leaving it to either annual or t

In theory, yes. But, it's state-by-state, enforcement at drive-time is next to zero (unless the cop just wants to hassle you), leaving it to either annual or time-of-sale inspections that are easily gamed (slip the mechanic a $20). Heck, people will reinstall stock parts for inspection then swap back to the illegal parts. Common with emissions stuff as well.