Real world driving and track testing will reveal how well or not well these $42 one piece rotors work. I dont think they will fail on the second lap at the track or mean you are gambling with your life every time you drive fast. We will know soon enough.
I personally bought BMW rotors, because they are lighter than one piece rotors and last for years with my driving. But I support people trying the inexpensive one piece rotors and do not subscribe to the theory that because you have a bmw you should spend a lot of money on original bmw parts.
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