unless you drag race all the time, get all four mounts, my boy did that to his tiburon the shacking is so bad ahhh, i got the ones for the frount and rear and i do alittle bit of racing myself and this imop will do what you want it to do you really dont need all 4 mounts unless you rally, really unless you want you fillings to fall out.. but get the frount and the rear ones you will get less engine roll and smother transitions between high rpm's shifts, you wont get that vilolent snap you get when you shift