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I just got the DBA 4000XS rotors installed on my 06 A4. My rotors where warped also. I did not have the old rotors measured or turned though. I did some research online and I have determined that driving at high speeds and braking, even slightly on some rotors causes hot spot that give you the warped feeling when braking. I got a set of DBA's for the front and back, and replaced the original pads with Red Stuff ceramics. I have not had time to test them but I will post back after I have some time with them. I will saw this much, they look good.
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