The WSR comes with the RE shifter. In earlier versions of the RE shifter, like the one I had in my 540, the WSR was sold separately. In any event, you will increase shifting effort and feel somewhat more "notchiness" with any short shifter, including the RE. I still remember how light (and long) the shifts were w/the OEM shifter -- you shouldn't think that the RE will provide the same light touch. But the compromises (slightly more effort required, and a little more difficult shifting into 2d when cold) are worth it. I'm happy with the RE; its never given me any trouble.