I have the AR DPs with race cats and ceramic coating - they are incredible with NO rasp that I can tell. They are hooked up to Eisenmann Race Exhaust; honestly, the DPs took the drone and rasp out of the Eisenmann, I know it sounds crazy but it is true as my wife noticed it too. They sound good and smooth out power delivery a bit, and the power is definitely up as the wheels spin more often . . . unintentionally.
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