Ive been reading up on underdrive pulleys and have heard both good and bad things about them. I am looking at the 5 piece kit from stuffforyourranger.com. It comes with the underdrive, alternator, idler, water pump, and belt. What are everyone's thoughts? Most of the reviews I read talked about the alternator not being able to put out enough voltage but with the alternator pulley im not concerned about it.

 

I haven't heard anything bad about underdrive pulleys, there are several guys here running them

 

Are they running e-fans?