Jason, I dont think theres a problem with this mod for most of us. the engine mount is too soft for performance and was engineered for the comfort zone of our cars. A gtp has the same motor and tranny and much stiffer dog bones than our liquid filled jelly roll motor mount
Yes, you're right on.
If we followed BonneMeMN'* advise, we wouldn't do any mods at all.
Rround basically described the mods while we were both talking on the phone laying under our cars looking at the structure.
Quite simple and effective. He has had no problems after 15,000 mi of hard driving.
Consists of fabbing up a metal pipe spacer with hard 1/2 rubber cushions on each end.
Most of the flex and vibration is now taken up by the subframe bushings. Much more positive shifting.....gets the power to the wheels instead of into the oil filled jelly mount.
It will also benefit the exhaust flex joint and improve its life.