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IMO, you can get an NBT retrofit from sites like BimmerTech and others. The options a limitless (to a certain extent) but those options cater to almost every feature our current previous production year vehicles didn't have.
Customizer Beware: Do your research, understand the components you'll need and the labor behind doing one of those electronic retrofits. You don't wanna order something that your specific BMW wasn't prewired for or unable to be updated to.
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