Powerflex Upper Engine Mount Insert PFF85-1821BLKPFF85 1821BLK acts to stiffen the voiding of the OE mount, helping to restore a level of responsiveness expected from a hot hatch. Made using our Black 95A durometer material, it provides a no compromise performance option for track focused builds. 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