Great Post Slick and I totally agree about the sway bars but I also acknowledge that when the BMW engineers were designing the E53 they had the technology from 1997-1998 and when they do a facelift that's all it is, the guts of the X5 weren't changed until 2007. Technology is advancing daily, different compounds, alloys and engineering advances will always make an after market part better than it's older counterpart just because it's more modern, so I don't think you can write off an after market part just because the original engineers didn't do it.

My 5c