Originally Posted by TheObviousChild
Here in the states you are allowed tint on all windows but the windshield. As far as I know, you can't get it done at the "factory", but the dealership will do it for a fee ($400 I think). The dealership does a great job though. I've had my wife's X3 done there as well as my coworker's M3.
BMW does not offer factory tint in North-America. But they do in other markets.
Perhaps it is something the dealers want to sell you themselves, so they don't want BMW to offer it as a factory option. Or it is to keep the number of options that are available for US customers to a minimum. Just like you don't have the a la carte options for the most part, but mostly option packs.
I have the factory tint on my car.