Have a read of these two threads:

http://www.xoutpost.com/bmw-sav-foru...66-what-k.html

And a very cool comparison thread here:

The Ultimate D2S Bulb Test

If I had OEM Xenon I personally would go for a Osram 66240XNB or Osram 66240 CBI



Osram 66240 CBI


Osram 66240XNB

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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