I'm another with Bilstein yellow sport....also known outside of the US as B6.

The Bilstein black touring are also called B4.

I'd agree with what David.X5 and admranger have said. It's definitely a notch up from the OEM sport suspension in terms of stiffness and firm ride. It corners very flat, and absorbs bumps pretty well for a car on 20's - but it is noticeable when going over sharp undulations in the road, you get a sort of sharp rise and fall in the front, followed by a sharp rise and fall as the rears cross the same bump. Kind of feels like a soft 'buck'. Some people probably won't like that, especially back seat passengers.

The ride overall is pretty much on par with my 2012 C300 with AMG pack, so, it's more for someone who wants a spirited driving style vs every day comfort.

If I had kids, or if I did long trips in the X5 - I'd probably have to recommend going the touring/black/B4.

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2005 3.0d Sport - Sapphire Black
Engine : Bluefin Superchip Tune,
Wheels & Sus: Style 168s (10.5s all round), H&R RDA Spacers, Bilstein B12, Eibach 40mm drop, Whiteline RSB
Exterior: Le Mans flares, 4.6is kit F&R
Interior: Dynavin N6, Blackvue DR650 dash cams

My Build Thread: http://www.xoutpost.com/bmw-sav-foru...run-sheet.html