Powerflex Engine Mount Insert PFF5-5452PFF5 5452 Engine Mount Insertisa two piece kit made using our Red65A durometer material, designed to fill the voiding of the OE rubber mount to limit drivetrain movement and sharpen throttle response on standard or mildly tuned vehicles. Mount rigidity is increased by 100%. A small increase inNVH, usually at idle, should be expected when stiffening the connecting mount between the engine transmission and chassis. The harder the material used, the