This is the high-tech solution to performance handling and control that O.E.M. manufacturers usually just don't offer! 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!