Not today, but two days ago I replaced the original steel two piece driveshaft in my '14 GT with a one piece aluminum one from Ford Performance. After 106,000 + miles I noticed that I was hearing a little more driveline noise then I had been used to. No vibration or anything else of concern, just a bit more sound. The car is quieter now, not that any Mustang is luxury car quiet. I suspect that the source of the increased sound was due to wear of the rubber ring surrounding the center support bearing. I think the bearing itself is fine. One good thing I will say about the factory two piece driveshaft is that it was always very smooth running and from everything I've been able to learn not very sensitive to pinion angle. So far I've only tested the new one piece driveshaft to 120 mph, but it is just as smooth running as the original.