FYI you can run 18" wheels with 380mm. You just need to be sure to buy a compatible wheel. See this thread for some of the options:
http://www.m3post.com/forums/showthread.php?t=659984
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc.
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