Anybody using FMS Alum. Driveshaft?

[White5.0]

i have on installed on my car, but it was already on the car when i bought it, it is definately lighter than the stock steel driveshaft therefore you have less rotating mass which in turn means more power at the wheels. but dont be fooled its not an incredible amount of change. my driveshaft also makes weird noises at certain speeds, its pretty cool to here it