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Ur and NST being almost the same depends ont hw weight and size of the pulleys. What were the weights on the NST crank and alternator pulleys? Stock SI cracnk is 4.5 lbs and the alternator is 9 oz's. UR's crank weighs a measely 11 oz's and the alternator is 4.5 oz's. That a big weight reduction. I have the UR's on my car and the gain with it is definately more then 4whp.
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