i do believe the X2/X2c shafts are harder metal because i have heard people say they are getting diff outdrive wear & pitting in the cups where the dogbone end of the shaft goes into the drive cup. Yet running the standard rat shafts they don't wear so much, so you have to ask do you want strength or save your outdrives... although the outdrives are a much cheaper part to replace & for what the drive shafts cost, you may as well just buy a mad-rat & rape the kit for the spares as the shafts as a spare part cost about half what a new rat kit costs.
I think a good solution would be the use of drive blades on the dogbone ends, but AFAIK there is no suitable ones that would fit out there & if there was you may have to dremel the outdrive to get them to slot in once fitted.
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