I was wondering what those coilover springs are for, are they for stiffer suspension or what. If you do know do I need other stuff before I can buy these. Thanks

coilovers naturally have a stiffer ride than springs, depending on which on you get...you can get something like ground controls which allow to raise and drop the car relatively easy...you will need to upgrade your shocks thogh...you can get something like tein one-pieec coilovers and that will allow to adjust the dampening and all that other good stuff