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Underdrive pullys is a noticable upgrade. I felt it more compare to my exhaust, or cold air intake. But i heard that the more engine mods the more you feel it, so its good to get it when you allready have other bolt on mods. Unorthodox is the brand to get.
Originally Posted by simplymike
Are underdrive pulleys a good investment? Will they affect the car at all?
