California is a massive market and has huge impacts on car manufacturing across the US. Put it simply, if a car can’t pass inspection in CA then it is almost not worth selling it. A car bought in Pennsylvania will have additional parts and components to pass CA smog standards. Not only would it hurt their brand loyalty to have a car incapable of being sold in CA, but it may simply be cheaper and simpler to build the capacity in for all cars instead of having two slightly different trims.