Underdrive pulleys if that's what you are referring to, they work best on craigslist. They almost always create charging issues and sometimes cooling issues. Most of the time an alternator upgrade wont do the trick either. That is because an alternator is designed to spin a certain minimum amount to work. With the ud's it wont spin that minimum rpm.
As for the water pump I would say get an electric one, but not with the ud pulleys. lol