Actually he said he has an under drive pulley. Slightly larger than stock and spins the alternator slower for a slight performance gain.

Which can over work and kill your battery over time

Ya, for a daily driver, its usually best to leave little things like that alone. There is always a negative, and in this case, the performance gain is minuscule considering your undercharging the battery.

I don't power a aftermarket stereo or anything. It only underdrives it by 14%. I think it would have worked, but I couldn't stop starring at it. I just kept popping the hood to check it. It was just making me too damn nervous, and like ya said, the performance gain was miniscule and not worth my anxiety

That would be an overdrive pulley. Underdrive means it spins less in an effort to save horsepower. ZZP has both the underdrive alternator and underdrive waterpump pullies. I don't understand why anyone would want to cut back on power production or cooling system performance. But...they sell them.

My misunderstanding. Thought it was the smaller pulley. ZZP seems to make a lot of HP increase claims. This is not one I would use

Wow, I think I skipped page 2. Sorry for the post with nothing new guys.

14% may have been a bigger thing than you realize. I started checking various connections and looking to bump voltage when I was scanning ign volts during some WOT runs. In my 97 I would see as little as 10 volts when the engine was looking for every bit it could get.