UMI Performance 05-14 Ford Mustang On-Car Adjustable Panhard BarThe panhard bar controls the side to side movement of the rear end under the vehicle. Flex and bushing deflection found with the factory panhard bar leads to erratic handling and tire rubbing under hard loads. This tubular set up uses fluted Energy Suspension polyurethane bushings, a QA1 heavy duty spherical rod end and is constructed of large 1. 250 diameter DOM tubing. An adjustable panhard bar is a must for rear end centering after vehicle