First off, what's your goal by changing the current exhaust? Power? Sound? Coolness factor? You have a great looking X5 so be sure that you want this type of exhaust b/c it's not only NOT a cheap investment, but one you gotta live with everytime you step on the gas; that sound will follow you everywhere. And do you have the V-8 or I-6. The eight would benefit and the sound would lend itself more to performance than the six. I like it quiet b/c that was BMW's goal; to ride like a car and not a SAV and still be capable of AWD attributes. And it's nice to turn on the stereo and actually hear it without blasting it or having to shout at your passengers. In my humble opinion, there are other ways to turn heads with and X5 than just exhaust. But the ultimate call is yours. Just be sure of what you want. BTW, all these are good exhaust companies. Search around a bit more and check out BavAuto too. Good luck and keep us updated.