Wow, I am blown away at the ridiculousness of this. How you correlated brake dust to "softness" or stopping power is really astonishing. I have Ferodo DSUNO on my car and my wheels are completely covered in brake dust within 30 minutes of driving. Does that mean they aren't good for the track either? On my GT3, I'd see brake dust on the wheel just going up the street and back. Now, that said, I don't see much brake dust on my 328d, so I think it's ready for track time!
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