Well after having my Prothane Race hardness Motor Mount Inserts in for a while I had the dreaded vibration issues that some complain about other were ambivelant. Well I just got my PolyBushing Trans Mount Inserts From Vitor in today and suprisingly the vibration is now much more like stock. It is definitely still there however it is much reduced from just MotorMounts alone. I can only surmise that after installing the motor mount inserts that the trans mount is overworked and not up to the task of being the weak link.