I had a 2004 4.8is, and it was a great, awesome car. Honestly, my 4.8i seems just as fast as my 4.8is though.

The 4.8is only had 5hp more than the 2007/2008 X5 4.8i. The exhaust note was better on the 4.8is, but in general the E70 is better.

I still think the front end of the 2004-2006 X5 looked WAY better than the E70 does, but the E70 rear end looks WAY better than the 04-06 models.