changing the springs doesnt FORCE you to change the shocks in the front, and leave the rear. it is just in your best interest to change them all at once. the combination of stiffer and shorter springs will make your shocks absorb like poo in no time. changing them all at once saves you time and money. dont forget the alignment right afterwards. and if you decide to keep a good amount of negative camber, dont forget to rotate your tires often.