Originally Posted by Sharif@Forged

I have yet to see a true power benefit from pulleys, done here in our shop..same day...same car.

I tend to prefer the OEM pulley, or something like a ATI Damper, rather than the lightweight aluminum machined pulleys. I have seen instances where the crank pulley and keyway on the crank shaft attacked each other, and destroyed the crankshaft. Not worth the risk, IMHO. Stick with stock, or hi end motorsports fluid type damper.