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Old 04-28-2010, 02:10 PM   #3
nathancarter
Registered User
 
Join Date: May 2007
Location: Riverview, FL
Posts: 1,394
My Ride: 02 330i
Agreed, not worth it unless you have a specific reason, such as brake fade while you're on the track. For cosmetics, the 330i rotors are the same diameter. For track purposes, the M3 rotors are thicker, so they have more mass for heat absorption and dissipation.
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