Exactly. Years back, I moved to California with an 80's sports car that was admittedly quite hotrodded, but I made very sure that the hotrodding did not worsen its emissions because 1. I wanted to keep driving the car in CA and 2. I don't want to pollute. First SMOG test in CA, the car blew clean as a whistle. It met emissions standards 40 years harsher than it ever had to meet.

Except I had all sorts of aftermarket parts in there from years of repairs, none of them with the all-important California CARB seal of approval on them, so even though it blew clean, it still "failed emissions" and I had to sell it to someone out of state. I'm still bitter about it.