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      06-17-2010, 08:07 PM   #30
jml
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Drives: X5M, GT3RS, GT4
Join Date: Dec 2008
Location: Austin, TX

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Quote:
Originally Posted by Green-Eggs View Post
Compare the weight of aluminum vs steel then it will make sense. The aluminum hat is the largest weight savings providing the car more performance as the rotational mass is lowered.
The OEM rotor-hats and calipers are already aluminum.

Check out this thread:

http://www.m3post.com/forums/showthread.php?t=398292