Yeah, Humboldt is one of the few, if not the only, county in CA that doesn't require annual smog checks. Lucky me, I guess. I don't like the smell of o/r exhaust, though, so the green cats would be the way to go for me.
That is true, things might also be a bit more lax up north. Either way, they help kill the smell which some LEOs can pickup on a catless car