I haven't tracked my car, but I would like to someday. I need some basic upgrades before that can happen, brake rotors being one. For a DD, the Z1 cross drilled and slotted would be fine, but I asked about the chamfer just in case I do get it on the track, which would be light duty anyhow. However, I went with the EBC USR slotted rotors for the bonus wet performance safety factor, since I encounter rain way more than the track despite the fact that we are in a several year long drought
