Powerflex Upper Engine Mount Insert, 3 Cylinder & Diesel PFF85-1821RPFF85 1821R 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