Reply to "Chirp sound from alt. belt area"

I checked with CB Performance today because they sell two non stock pulleys. PN 1931 which is what I bought for about $75 and PN 1912 for about $45 and this one looks to be a smaller diameter on the website. In fact they are the same diameter at 4.25 ", just that the last one is made in Taiwan and the better one is made by CB Performance. 

So now I'm wondering why would they make one that would turn the cooling fan slower than stock ? 

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