I can say that they DO make a huge difference in stopping power over the stock brakes. I just returned from a 3200 mile road trip over almost 2 weeks down to California and back. I drove on all sorts of roads from highways, twisties, back roads, etc..and these brakes performed magnificently. I can't recommend them enough as a result. I honestly think that these brakes are perfect. The Brembos are a bit overkill IMHO and on top of that I think the 'royal blue' complements the X5 perfectly. Still not sure why Zip's rear calipers are black but mine (and wdimagineer) are blue.
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