Ford Under Drive Pully

[scooby]

Is there really a benfit to install one or is it just a waste of money. This is on my 5.0

[Mhiggs]

I just put a set on mine and it felt the same as when tony had the tuner on my car ~20hp

[slowLX]

Waste of time and efficiency of accessories. A good investment would be an electric fan and smog elimination.

[scooby]

Im going order some more stuff for it and the fan and the smog delete where the first to thing. So i figure i check on underdrive pulleys but some one said you had to change the belt for that.