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Message: <blockquote data-quote="ttocs" data-source="post: 909469" data-attributes="member: 11896"><p>because what spins faster?  Your alt?  it actually spins slower, which taxes the voltage regulator and also keeps it from cooling properly.  Everyone I known(including myself) has mysteriously lost an alt with in a year or two of installing them.  At the very least be sure to keep your stock pullies.  I almost sold mine but kept them thankfully.  There is a reason why you will see people selling those used and looking for stock pullies.  Once you start to step up to the bigger mods of head and a cam the few hp they gain at the result of slowing your cooling system and alt just isn't worth it IMO.</p></blockquote><p></p>