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Old 03-26-2007, 08:57 AM   #19
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Join Date: Aug 2005
Location: San Diego, CA
Posts: 3,005
My Ride: '99 323i
Just to consolidate info, here's the E46 M3 rotor sizes -
M3 - 325x28 front, 328x20 rear
M3 optional drilled (ZCP) - 345x28 front, 328x20rear

I believe the minimum thickness would then be 26.4mm and 18.4mm, but it would be nice if someone could confirm this.
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