The rear end has significant improvement in terms of dynamic rigidity though I do feel the harshness at some speeds (a.k.a. 40 mph and 65 mph). The exhaust vibrations are now felt as well. Once you go through a corner with this, getting on the gas mid-corner, the rear is planted and is a lot more predictable. In combination with the engine mounts, pitch stop mount, differential inserts, and transmission bushing; these subframe bushing made the most difference with all the other combined. They removed whatever slop you had in the drivetrain.