<strong>09. </strong>We had the Bronco in the sand just a few days after the underdrive pulley kit and throttle body were installed. Many times, when we install smaller-scale performance mods like these, it’s difficult to feel a power difference from the driver’s seat. In this case, we could actually feel some increased pep. And we’re happy to report that we didn’t detect a noticeable loss of efficiency from the A/C system, the alternator, or any of the other accessories driven by the engine pulleys and belt. It looks like we can chalk this up as a win/win.