Polyurethane engine and transmission mounts are designed to limit unwanted movement and control torque thereby putting more power to the wheels and also reducing the chance of breakage.You will notice performance gains on the street or track with these almost indestructible mounts. Motor and transmission mounts are strong and tough like a solid metal mount without the vibration and noise. They reduce wheel hop possible engine damage and drive train movement.Very durable resistan t to oil chemicals and road contaminants that deteriorate ordinary rubber mounts. Feature application specific engineering. In other words they are not a universal one fit all application. Manufactured of the highest quality specially formulated polyure thanes