I upgraded my front and rear shifter bushings at the same time, so I cannot speak for replacing the rear after upgrading the front. The stock rubber bushing was mushy compared to the KR piece. I will say that I am so pleased with the feel and performance of my shifter that I have resisted the urge to jump on the MGW 2 bandwagon. Until I can feel the smoothness and precision of the MGW 2 for myself on another GT500, I am not changing my shifter.