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Originally Posted by mikerunt
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I have not. Why not get a used f8x CF driveshaft knowing it has gone through BMW development, including bonded joint longevity, and mileage testing? BMW stopped using them, except for in CS models, because the CF driveshaft didn’t fit with the newly required OPF in ~2018. It’s easy for a small aftermarket company to get the adhesively bonded joint thickness and length incorrect as well as improperly designed metallic-to-CF bonded joints, use of incorrect adhesives for long-term durability and improper CF ply angles for torsional stiffness and strength and bending stiffness critical speed failure (8300 rpm redline means you need a very high bending stiffness to prevent an out-of-plane rpm instability bending failure).