Mopar Viscous fan??

That particular fan frees up HP over other fans. Mopar sez it's good for 15 HP.

I read 2 different mags dyno results that comfirm it. How would it be nosiey? You'll never know it's there, it's a flippin fan in the engine compartment like any other fan?

I don't understand the question on how it could be loud. How does a mech. fan like that be loud to begin with?
Flex fans are nosiey.

If I remember right, there are 2 types. One uses silicon based liquid sort of like a torque convertor, the other uses a thermostatic control built into the hub. That might have a whirring sound as it grabs. I used the silicon based hub.