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When it comes to spinning mass, so many people seem so booked on WEIGHT when what really matters is MASS and MOMENT OF INERTIA.
The driveshaft has a very small moment of inertia, so you'd have to rip a hell of a lot of mass out of it to know the difference.
Further, by material, the thing has no frictional losses, nor energy transfer losses (like a diff). Unless you are a long way into the car's performance already, you have money that you have no idea what to do with, or you put a mirror under your car at car shows, it's definitely not a way to go.
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Disclaimer: The above post is on the internet.
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