I thought so to, but I asked the technician at the alternator shop, and he said the other pullies still make a sig. difference in the way the accessories turn. Dont take my word for it though.... Call your sources like I mentioned for some real answers. I was just about to order pullies before becoming educated on them from non-biased sources. Wouldnt ford have put them on originally if they were better. You have a company in ford that spends millions in R&D vs. imitators that think they have better answers. Yes, a lot of mods are great, just not this one..