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i have one on my sentra and have them on several vehicles and only time i had to replace alternators was due to fautly rebuilds from autozone...after the 5th or 6th one got one that was rebuilt right...lol....I beleive they help gas mileage on the top end(ie highway driving)....Motor definitely revs faster/easier...
i say get it and enjoy it! couple one with removing the a/c belt and you will see the difference in your mpg!
and post pics of your underdrive pulley! who makes it? I have an Unorthdox Racing Under Drive Pulley....also have under drive pulleys from G-SPEC performance(greg is the man!) for my turbo 2.0 GTI-R Motor(not eco driving friendly...LOL)
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