Installed the short shifter, and new large bushing on 2002 WRX. Cut out top mounting plate to avoid any contact (there was a little - but not much), lubed shifter pivots and joints with lithium axel grease and still have loud gear like noise in the cabin when under compression or acceleration. I don't have a low value torque wrench so I guessed at the tension and tried to not over tighten pivot pin. I even put metal washers on both ends of the pin bolt to try and help isolate the pin from the shifter. This radiates from the shifter lever, as touching it changes the noise.
It is pretty loud.
Would really perfer to eliminate the noise if possible. When the music is up not a problem, but with my wife in the car it is VERY noticable. She prefers low or no music.