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I have a question for everyone that has put underdrive pulleys on their Focus. First of all I relatively new at modifying my car and i have been looking at all the different sets of underdrive pulleys and i wuz wondering which one everyone uses and gets the most out of Focus Sport, Focus Central, Aem, or Unorthodox, or any other that anyone has had success with. The other thing i was wondering is how hard are they to install? i appreciate any response. thanks