I too have the 3.0d Sport X5. Thinking of getting it Chipped aswell.
Am based in the UK. Anyone know of a reputable place to get this done?
I've heard that BHP goes from 218 to 250BHP torque increases aswell.
Top speed from 130MPH to 135.
But dont quote me.

Also am i correct, i assume that i am, that the warranty would be void? would i also be correct to say that the maintenence/service pack might be effected if the car is chipped?

Guess only worth doing, if their is a big difference in performance!!
If you get the ECU remapped back to original settings, would BMW know that it was ever remapped in first place?