PFF85-1823R acts to stiffen the voiding of the OE mount, helping to restore a level of responsiveness expected from a hot hatch. Made using our softest Red 65A durometer material, specifically for Diesel models, the amount of NVH transmission is limited. A small increase in NVH, usually at idle should be expected when stiffening the mounting between the engine/transmission and chassis. The harder the material used, the greater the NVH transmitted. For total drivetrain control, this new insert is the perfect accompaniment to PFF85-1821R Upper Engine Mount Insert and PFF85-1822R Upper Engine Mount Insert.