Cusco Engine & Transmission Mount Set Subaru WRXThe engine & transmission mounts utilize a higher strength formulation of rubber compound, called HD Rubber. Replacing your factory mounts with these will stabilize your power train and help eliminate that annoying chatter or knocking from old, broken mounts. The result is a more linear and direct engine feel during high revolutions, which translates to a more responsive power output in reference to throttle position. Used in professional motorsports