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I have the Jspeed Underdrive Accessory pulleys. They are somewhat underdrive from the OEM pieces, but I doubt they added very much power, but it must be something. The quality is good and they fit the belts of an XD!
 

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The unorthadox pulley weights less than the box it came in... heh. Its also noticably smaller than the stock pulley.
 

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evil247 said:
look at anywhere from 3-4 from the underdrive I don't think the accessories add any power more for looks than anything else. I took .2-.3 seconds off when I had the underdrive installed in the 1/4


i agree with the gain from the UD pulley, but the accessory pulleys do a little more than please the eye, they are good for quicker engine responce.
 
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