Originally Posted by RC45
The current C6 Z06 is the better track car - period.
And with a few NA engine mods (as I have proven) you can have a daily drivable pumpgas 660bhp LS7 
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Tires make a huge difference
OE for OE, the ZR1 will out handle, and likely "break away" with more predictability then a runflat Z06's tires.... the weight bias will likely also aid in that.
Think of the ZR1 vs. Z06 as a SLR vs. a sL55 AMG but not exactly