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Good research on the topic...
Along with the article, IMO the pulleys are worth it...I installed a UR "SS" pulley on my turbo altima and noticed a difference in the midrange...granted my 'ass dyno' isn't always the best method in terms of actual power output, what it is best for is creating a bigger grin on my face when I know my new bolt on made a difference
As for pulleys, you could always check out the Enjuku Racing pulleys that they sell on their site....about 100 less than the greddy set, and I believe lighter as well!!
Always remember, peak HP means nothing...it's all about the powerband gain!
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