3. With our baseline lap times established, we took our Challenger over to inline performance Specialists to install the Energy Suspension bushings. Inline Performance specializes in Mopars, and has all the necessary tools to perform the suspension work on our late-model Dodge. in the front, we removed each of the components individually to replace the bushings. Hyper-Flex polyurethane bushings are available for all of the front suspension components including the upper and lower control arms, shock mounts, and rack and pinion.