So is the carbon fiber door pillar accents sold by BMW are simply and overlay? Not an actual replacement of the shadowline trim?

It does look nice. Considering this upgrade for my X5. Shadowline trim is hard to take care of.

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2008 X5 4.8
White w/ Black Interior w/ Bamboo Trim | Premium | Sports + 214" | Tech | Cold Weather | Rear Climate | Premium Sound | Active Vent Seats | Heads-Up | Comfort Access | 3rd Row | Aero Kit | Huper Optik Tint | Clear Reflectors