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Functionality, they do nothing. I don't have a problem with pants getting dirty but, then again, I'm 6'3" so probably step too far out when getting out. Aesthetically, IMO they do make a difference it adds more of a sporty flair compared to not having them. I don't have any issues with stains or rust spots (I just wipe them down with Armor All as I'm doing the lower trim with it). My $.02.
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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
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