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Forte might be a little disorganized but he knows cars inside-out and backwards, he helped me supercharge my car and tune it afterwards, he definately knows what he's talking about.
underdrive pulleys are larger pulleys that don't use up as much engine power, its not like putting on a cobra intake as far as power gains, but every little bit helps, and putting on all the little parts adds up and makes your car run better in the end.