PFF44-108R is made in our Yellow 70A material and recommend for road use. A small increase in NVH, usually at idle, should be expected when stiffening the connecting mount between the engine/transmission and chassis. The harder the material used, the greater the NVH transmitted. Please check the size before ordering. PFF44-107 is 62mm Diameter, whilst PFF44-108 is 70.5mm in diameter.