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      03-26-2012, 06:30 AM   #90
Focusedintntions
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Drives: 2011 135i M-Sport :D
Join Date: Nov 2010
Location: NoVA

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The calipers actually have a fairly wide slot in them. RB rotors are thicker than the stock rotors by 3mm and fit with room to spare. M3 rotor isn't any wider than the RB rotors. The m3 rotors are a floating rotor...having it be a 2 piece rotor wouldn't do much unless you were able to get a lighter hat.
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