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Underdrive pulley for a V6

1694 Views 6 Replies 5 Participants Last post by  s197inthe208
How exactly do underdrive pulley's function? how much power would I pick up if I installed one on my 4.0 v6?
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Pulley improvements are definitely minimal, but if you're running out of mods and you don't want to go F/I yet, I guess. Kind of steep on the $ to hp ratio though.
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