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As someone who has friction welded a feramic disk to an ACT chromoly flywheel I just wanted to say that it took a full boost 6000rpm 2-step launch to do it. I wouldn't worry unless you plan to be doing that at some point.
I used to use ACT street disks on my Mitsu but got tired of having to change them every 100 launches or so. I don't know how it would act on a BMW but I ended up being happiest with the ACT unsprung hub race disk. Yes, it made the drivetrain a little noisier, but it lasted forever and was no problem to drive on the street even with a light flywheel. It didn't chatter at all...chatter comes from high friction (like feramic) and a sprung hub.
Having said all that, I swore on my next car I would spend the big bucks for a carbon-carbon clutch that should last the life of the car no matter how much I abused it. I hope such a thing is available for the 335 when my stock clutch goes.
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