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I have heard that the carbon fiber half-shafts are more of a High speed type of thing. They are perfectly balanced and work well at high speeds, however they aren't made for extremely high torque applications. This is just something that I' ve heard and you may want to look into it further before taking my word for it.
Doug..here is a site I found check it out...as you can see they do produce half shafts for looks like c4 and c5's, but they can also custom build shafts...here is the link http://www.pstds.com/carbonfiber.cfm Good Luck!