I just had both front axles on the '04 X5 4.4i replaced, as well as getting four new Nitto Crosstec tires. Tire and driveline noise are way down, but still noticeable at low speed. I wonder if it's because of all the hardware in the awd. Since I haven't driven another one for comparison, I'd like to hear from others about whether this is "normal". I'm specifically asking about low level "mechanical" noise.