PFF3-1323 Upper Engine Mount Insert is made in our Yellow 70A durometer and is designed to fill the voiding present in the original rubber mounts.      Reducing engine/transmission  movement by way of upgraded  inserts has the following benefits:      - Sharper throttle response  - Reduced wheel-hop  - Improved Traction  - More balanced on/off throttle handling  - Prolonged the life of the OE mounts