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if your serious about the head unit upgrade deal with bimmer-tech, its more expensive but is flawless oem form, fit, and function. I did a full retrofit and it is not hard, there is also a write up i did for it but i have yet to add in pictures.
I haven't used any of those CF parts but would guess they are ok, not great but should be able to be installed in a few hours. and a shop would be able to handle them no problem. you will not feel as bad destroying a splitter or diffuser when they are cheaper. a genuine vorstiner or other name brand will be a couple of thousand just to get scraped around and ruined. buy yourself a new one when its destroyed, they are cheap enough.
I daily mine and i do all my own maintenance. just the proper maintenance goes a long way.
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