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      10-26-2012, 08:59 AM   #6
CJ421
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Drives: 2011 E92 335i
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2011 BMW 335i  [4.66]
This is a good thread:
http://www.e90post.com/forums/showthread.php?t=508485
Bottom line, I wouldn't do it and not only because you have to replace parts. The M3 has a different braking system entirely (different master cylinder) ... who knows what kind of effect that will have on braking performance.
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2011 BMW 335i E92 - Le Mans Blue, 6MT, M Sport. JRZ RS Pro, Quaife LSD, BMW Perf Exhaust