I agree with Mr. MotorDavid...i originally had an '03 3.0 and I put staggered 20s style 132s on them and they worked like a charm. Just plug and play...no issues about rubbing, traction or other computer errors regarding your concern.
I'm on my second X5 and I got an '04 3.0 again and i still upgraded to a staggered 20s style 168s and they work flawless.
http://www.en2creative.com/BMW/CAR1.jpg
http://www.en2creative.com/BMW/CAR2.jpg