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I'd rate them as great for a tire to do DE's and Auto-x's combined and on a car that you drive to and from the track on them. I had 2 sets of them on my Turbo Miata and they gripped very well and got heat fairly quickly. They did get a bit greasy towards the end of their life when they got really hot. The car weighed 2100lbs and was on 225's square though so it was pretty easy to not over heat them.
I'd say compared to NT01's they're much less grippy, but I wouldn't want to DD on NT01's.
The R888's came with the 911 and I'm doing my first track day in this car on the 21st so I'll let you know what I think about those.
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