BMW altered the design of the American i3 REx for the worse in order to qualify for the white sticker.
The American version has a smaller gas tank, wont engage until the battery is at 5% and will not regenerate the battery only maintain at 5%.
The European version of the i3 REx the generator can be driver engaged when battery falls below 80% at higher speeds and maintain charge plus it has a larger gas tank.
Evidently BMW thinks the White Sticker is important because they jumped through hoops to try and get it.
Yikes, while I'd never consider the REx an option for WA State residents (due to having to pay sales tax) it seems like it might be dead in the water in CA as well since without the REx I'm assuming you'd definitely get the white sticker.