Same benefit as a lightened flywheel: reduced rotating mass.
Also, less looses due to the center joint on the OEM two piece drive shaft. And with a CF one if/when it finally does fail it'll just turn into a cool and expensive broom and won't come through the floorboard.
The negative is that one piece drive shafts are more likely to fail than a two piece... BUT there is another option..... a custom LIGHTWEIGHT two piece made to order by a local DS shop!
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