4.6is and 4.8is
A sporty model badged 4.6is was released in 2002, having both exterior and interior decorations, including 20-inch wheels. The 4.6L V8 engine was developed by Alpina from the 4.4L V8. A sporty model badged 4.8is was also released a few years later replacing the 4.6 engine with a 4.8-litre (also developed by Alpina and used in Alpina Roadster V8, based on BMW E52 Z8). X5 4.8is was labelled "fastest SUV in the world".
Read more about this topic: BMW X5 (E53)