Ill clear my message up They make the engine noise a little bit louder as its more harder connected (awesome ingerlish I know!) to the chassis, but there isnt an appreciable difference in vibration and harshness, but it transformed the car, it went round corners better, accelerated better, braked better, it was like a transformed car, all because the engine now wasnt chucking its weight about and was firmly fastened to the car which is nice