Search is your friend, there are several 'tint' threads on this forum. Here's one:
http://www.1addicts.com/forums/showthread.php?t=15365
That ones goes into great detail about choices, cost etc...
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2018 X3 30d, Carbon Black Metallic, M Sport Package, Panorama glass sunroof, Lumbar support, Instrument panel in Sensatec, Ambient Lightning, Harmon Kardon Surround Sound , Dynamic Damper Control