Originally Posted by jcorreanyc

The 4.6is and 4.8is had larger rotors and calipers in the front (356 x 36 mm) vs the regular 332 x 30 mm on 3.0 and 4.4i X5s. The rear was the same diameter but vented on the 4.6is and 4.8is, so they were thicker than rotors on pre-facelift 3.0 and 4.4i X5s and facelift 3.0s.



Anyway it's a nice, easy, bolt on upgrade for anyone with smaller brakes.