A good tip for Kampenhout for the X-5 is to run 4wd front tyres on the back and stagger ribs on the front. Because the X-5 naturally generates a lot of grip you may find the need to run a little bit less tyre than most other cars.
Dan Greenwodd and Chris Longs X-5's were awesome with this tyre combo at the Belgian GP.
Give Dan a PM, maybe he can give you a few more pointers
