red94five0... pulleys are totally worth the $$$... just make sure you get a good quality product, not
BBK or MAC, and make sure they are aluminum! (the parasitic loss is amazing between those and steel!)
www.rpm-mustangs.com has them for hella cheap too (ASP Aluminum ones)... through a misprint on the website, I got mine for $65 shipped!... other places I've seen them are $115...
-you will notice a slight battery drain at idle, when the car is warmed up... but nothing to worry about... just slight dimming of the headlights, and not as strong blowing of the air if it is on...