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what do underdrive pulleys do? does it give you any performance or?
Under drive pulleys free up HP from driving the engine accessories, ie: P/S, A/C, alt, etc, and sends that HP to the rear wheels. Depending on the size of the pulley, you may see around a 10 HP or so gain. Here's the rule of thumb. 99+ gets the 42% pulleys, and frees up more HP than the 98- 25% pulleys.
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