To my knowledge the front Bilsteins require no modifictaions to run coil overs. The rears require a groove cut into them for some sort of snap ring to fit in, which supports the threaded coil over tube. Also, you may want to run the H&R race springs with the Bilsteins. That's what I have and it's not too stiff at all in my opinion but still corners really flat with the stock sway bars. With the stiffer springs you should never have to change the swaybars unless you want to go to an adj. in the rear.