I had a set on my old E36 and it looked gross so I took it off right away, especially if you have alot of gap between your wheel spokes. It looks a big black thing that blocks your rotors, also I think it might prevent the brakes from cooling correctly. I think it's much better just to get dustless brake pads. I have a set of Axxis Ultimate pads and there's waaaaaay less dust and still bites hard.
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