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I have Zimmerman drilled rotors and I'm not all that impressed. I installed them with new OEM pads, and do not do any heavy braking or tracking, yet all 4 of mine have minor stress cracks around the holes. The other issue I had to tackle is that the hats all rusted..bad! (area between where your wheels bolt up and the braking surface)
If you buy these, I would suggest using high temp silver paint on the hats BEFORE installing the rotors. If you wait till they rust (like I did) you'll be spending quite a bit of time sanding off the rust, priming and prepping them for paint.
my .02
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