JOHNNYCHIRO on BimmerFest got his grilles painted black and he reported no issues. I've seen another thread about someone painting them. If you scuff them up right, prime and do a good job, I don't see a problem painting them.
Also, If you care for the matte black grille look, plasti-dip is an option. I plasti-dipped my grille but I peeled it off because I prefer the gloss black look. Was fine for the few weeks I had it on.
I also have a 650i with Night Vision.
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