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For vehicles that employ a front engine and front wheel drive (FWD) system with a transverse engine layout, the mounting insulators for installation of the power plant require the following five performance items: ➀ Minimization of shock transmission from the power plant to the vehicle body when accelerating or when changing gears. ➁ Minimization of engine vibration transmission when the engine is idling. ➂ Reduction of vertical vibration of the vehicle body due to input from the road. ➃ Reduction of unfavorable shock resulting from the delay in movement of the power plant against the vehicle body due to lateral acceleration exerted when steering the vehicle. ➄ Blockage of noise transmitted from the engine and transmission. Up until now, there has been no effective means of adjusting the mounting insulators so that all five required performance items can be satisfied at the same time.