Chiming in here about he Z1 2 piece. I had previously thought the same, more for showing vs going. But after redoing my brake cooling I'm not having issues with them any more. I want to say that the 370 ones are thinner than the 350 so they don't hold heat as well etc, but after redoing my stillen kit (moved the intake out from the "fang" area so its a better flow) 0 issues on the same rotors for a year, 4 full track weekends and a few single days. I'm assuming sometime next spring they will grow a serious crack vs the typical heat webbing and i'll replace them.
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