i do believe the dunlop's performance while cold is one of its selling points for autocross.
while it may not be the fastest tire in successive testing (where did the Kumho come from?!), they are known for their cold grip, which makes them outstanding in the wet, when you CANT build heat. also, most street tires wont build much heat at all in a standard autocross.
no idea about longitivity, thats just what i've heard from users.
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