You can get custom driveshafts made from local shops, and an aluminum driveshaft is an option.  The stock, factory driveshaft is pretty light already, and aftermarket aluminum custom driveshafts we've measured don't offer more than a pound or two weight savings.

For the ultimate in driveshaft technology, you can go with a carbon fiber unit from ACPT.  ACPT will custom make one for your FC3S if you're willing to spend close to a cool grand.

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