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Adding a set of underdrive pulleys to your Mustang guarantees a noticeable improvement in horsepower and torque. For years, drag racers have been installing underdrive pulleys to slow down their accessory belt drive. This leads to significant gains without any negative effects to your charging system. Whether you own a V6, 4.6 or 5.0, underdrive pulleys should be at the top of your modification list.
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