Andrew...do you know more about the "illuminated key?" Is this just a little LED that lights up when the buttons are pressed? I can't find any pictures with this. All I come up with is something like the E39 where it's like a flashlight. Not sure how useful this is. I would bet the diamond key is the most useful.

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6