How many miles do you have on the S04's? If they are new it takes some wear on them as well. Also, they are not a tire I would recommend for drag racing. There are much better, but if you are looking for performance running canyon and such they will hold their own with PSS's and the alike. In a straight line any real performance tire will need a decent amount of heat in them to perform. I ran S04's while being boosted and they worked just fine!!!
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