CARB forced a bunch of crap on California-only Volkswagens in the '70s and '80s. And they could do it, because at that time, Volkswagen sold a significant chunk of the US sales in that state... more than any other. Some examples: 1974 Beetles, Ghias, and Things got a dual-preheated intake manifold, which meant the entire intake manifold, muffler, rear tin, was all specific to JUST those cars. 1974 Transporters with automatic transmissions got L-jet EFI. Manuals, and the rest of the country regardless of transmission got dual carbs for '74 (1975 all the Transporters got Bosch L-jet, as did the Beetles). My 1979 CA spec Transporter had electronic ignition (no points, like everyone else had), no EGR (curious... as the others DID), a completely different CA-only exhaust system with a specific catalyst that cooked the left cylinder head to death, and lambda feedback control (49 state Transporters did not have lambda control, and had a tiny little catalyst attached right ahead of the muffler).
Bunches of other CA-only stuff from that era... like the often made-fun-of 1980 CA-only Corvette, that was automatic-only, and 5.0L smogified V8 that managed a whole 105hp ... LMAO!
Don't see that anymore, because other states were allowed to adopt these CARB standards, and it became more difficult to make two versions. But there are still certain cars that were sold primarily [new] in CARB states that were not sold elsewhere. Like the Altima hybrid, or the RAV4-EV, etc.