AFX Pulleys?

[Fez1085]

I am seriously thinking about buying some AFX pulleys from howell automotive for about 140.. i've also seen Pulleys from cosmoracing.com for about 80 bucks. I really like the "pros" about pulleys, i hear stock pulley are about 10lbs on Non-Turbo's, and i've seen aftermarket pulleys that are around 2 pounds, and since every pound taken off the crank is on average 2.7hp, then by doing the math, thats like 21hp at the crank.. but from what most ppl say, they get like 10-15hp.. i still like those numbers, but I think in the end, i'll go with the AFX's b/c from what most ppl. say about them, they are pretty good.
Anyways, the only thing i am worried about are the "cons".. since i have a 800watt amp.. will i be okay? i know some guy on this forum had a 500 watt amp, and was fine. I also know a few guys on this forum have driven a little bit, and and then the next day their battery is dead.. am i going to have to worry about my battery dieing? also during my research, i've come across something called Harmonic Damening or something? From what i've researched, i guess thats only a problem in the turbo models, and not the nt's.. can someone explain that one to me?? also, since i have an aftermarket header that is stainless steal, without a heat sheild, do you think my header is creating so much heat that my car will over heat since the water pump isn't getting a lot of power? any input would be great, thank you!

 

[xcelr8n]

i remember reading a while back, that many non turbo owners considered this to be the single best mod they had done to their car etc.
for your amp question i cant help you out

 

[Fez1085]

what about the harmonic dampener? the one from howell doesn't come with one, and i just got done reading how it'll break down your engine from the vibrations, do you know anything about that topic?