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They replace the crank (or is it cam pulley - I'm having a brain fart - I'll have to go look and see what I replaced a year ago!) and alternator pulley. The idea is to put less pull on the engine which frees up horsepower. Not a bad mod. You have to use a different size serpentine belt. When I bought my pulleys they came with a new belt.
 

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i have a question about this, by saying it revs faster or quicker, doesnt that mean quicker reaction time... just trying to see what you actually get out of this, thanks
 
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