Powerflex Upper Engine Mount Insert PFF1-1125This insert is made in our Yellow 70A durometer material for increased transmission mount longevity and performance on Petrol or tuned Diesel engines. Designed to fill the voiding in the OE rubber mount, it smooths out gear changes and throttle application by stiffening and supporting the often perished rubber, a common failure on tuned vehicles. This supports a more precise and settled transmission response during acceleration and deceleration. This