I see underdrive pulleys online for about $100 and am just wondering if anyone has tried one and can tell me whether it's worth it or not. I'm always keen to squeak a little extra power out of the little 1.6 and if this would be good for a noticeable difference, I think I would go for it. But noticeable on these cars is 5-10 percent so I'm not sure if such a thing would yield that kind of increase.
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