Ok, I just found this in a wheel thread:
Quote:
Brake sizes:
328i front brakes: 12.3" / rear - 11.8".
328i M sport brakes - front: 13.4" / rear: 13.6"
335i front brakes: 13.4"
335i M sport brakes - front: 14.6" front / rear: 13.6" rear
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I'm almost sure that the M-Performance rotors are 370mm front and 345mm rear and those number converted to inched are 14.57"/13.58"
Just not sure if the original poster is correct on those sizes.