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You actually can turn drilled rotors its just time consuming and nobody likes doing it. So they say you cant. My rear rotors were warped when I was still under warranty so BMW replaced them. The make an awful roar during high speed braking.
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2014 335i M Sport 
2010 328i M Sport
2007 Z4MC #1019/1815 (Sold)
1997 M3 (Sold)
1991 325i |