Small but very reputable company. We have used their rotors on a 25 hour car for 2 years and they're perfect. They last forever.
Granted, they have little representation in the BMW community but I would call them and ask for some data. I would want to compare their 4 piston front compared to the 6 piston StopTechs for braking power, heat, and brake pad availability.
I would be tempted to go this route if I were thinking about a brake upgrade on my E9X.
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