There is a thread over at Bimmerforums about the name ID on a 4.6is or 4.8is and what the "S" stands for....

I figure there must be someone here that really knows the answer.

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- 2005 X5 4.8is: LeMans Blue, Black/Blue Alcantara Leather Interior, Navi, Retractable cargo floor, Rear Side Impact Air Bags
- 2011 335i Sedan: Vermillion Red, Navi, Beige Leather Interior, Harmon Kardon Audio, Fully Loaded
- 2006 330xi Sedan: Titanium Silver, Navi, Dakota Leather, Fully Loaded
- 1987 Yamaha: Virago 700cc