Good luck with the 4.6, I cant wait to put my new knuckles and brakes on! might even source out an "iS" decal for my 3.0i , I figure with the sport package, and some monster brakes it wouldn't be a poser! lol!
Dean, still need anything for yours?

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2003 X5 3.0i (02/2003) sport package, Sapphire black metallic / Black Dakota Sport seats. compass mirror retrofit, trailer hitch retrofit, Prodigy P2 trailer brake controller installed, PDC retrofit, Lumbar support retrofit. heated rear seats retrofitted. Running boards retrofitted and subwoofer install in progress. 4.8is Brakes installed front and back. Bluetooth TCU installed, Rear Fog lights installed. Retrofitted reclining rear seat backs.