Energy's complete Master Sets, both restores worn mounts and bushings as well as adds a dramatically higher degree of performance to any vehicle. These Master Bushing Sets offer complete coverage front to back of the vehicle's chassis. Energy's special formula HYPER-FLEX™ performance polyurethane components, which is higher durometer (firmness) material and reengineered performance-minded components, assures long-lasting performance in all sets. Performance many O.E.M. bushings and mounts just can't offer. For cars on the street and weekend racers (both front and rear wheel drive), yet so good–successfully used in pro racing! Test submitted to Energy Suspension® from Ford Motor Company® have indicated that the vehicles tested with the Energy's Master Sets exhibit substantially improved stability and control under high performance driving conditions.