The X5 needs the 3.0 twin turbo. The current I6 in the X5 sold in the states is woefully under powered for a car of this size. In the recent comparison in Car and Driver, the X5's 0-60 time was just 7.8 or about on par with a Honda Pilot. Ford is running a commercial about it's Edge SUV being .2 seconds faster 0-60. The commercial goes something like "hey the X5 is scary fast, but get this the Edge is .2 seconds faster." I shake my head at this commercial every time because apparently 0-60 in 7.8 seconds is "scary fast." I also hate when lesser car companies try to use the premium cars to prop up their own pieces of junk. Hyundai is comparing their junk to the LR3 and 525.