The black slats have always been (as far I can recall) on all 6 cylinder models no matter what trim and 8 cylinder got the titanium. On my old X5 3.0 when I bought it in '01 I had the Sports Package but had to order from Parts the titanium ones that were on the 4.4.

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film