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I'm running it with Hawk HT-10's on the front and the Cobra kit with Hawk Blue's in the rear.

I've had no problems, but the HT-10's are very aggressive for the street and dust like crazy.



next time run the portfield RS, I find their better than hawk's without all the brake dust



The R4-S is a street pad and not comparable to the HT-10, which is a track pad (even though I drive them on the street).