As others have mentioned, the install is pretty easy. I have a 6spd and noticed smoother shifts and less perceived drive train slop. I have a JHM short shifter which took out some slop, but this seems to make things a little tighter. I only did a quick drive so I probably need to drive more.
So the way this thing works is by adding the bushing and the large washer between the diff and the pressed in cylinder and by putting the counter sunk washer on the bottom to compress the rubber there. I get that it is tighter and has less play, but I am curious about the geometry of the drive shaft and the diff itself. The bushing raises the diff about 1/4 of an inch higher than where it sat on top of the OEM bushing cylinder thing. Is there any stress caused anywhere with this adjustment? I know some folks used something similar on B7s. Did they function similarly and raise the diff up? Any issues after long term use or am I just overly anal in worrying about 1/4 higher diff?