reduces weight
easy to change springs if youw ant 2 different setups..
ride height adjustability
i had x2cs and they are loud! clanky and such since there are no bushings another set with aftermarket caster cambers would be a different story. Just look at the set you are buying and think about if there will be metal on metal contact.
I had 14 iinch 175 pounds and they handled BETTER than stock springs. i put them on and my friend thought i had put my sway bar back on.
INATALL:
i did them with brake calipers on.
1. lower strut down by undoing top bolt and losening the strut mount bolts.
2. undo brake line bracket
3. yank the stock spring out however you see fit. be careful and turn your face away.
4. HERE IS THE TOUGHEST MOST TIME CONSUMING PART. You are going to have to remove the metal plate that is on top of the strut that contacts the bump stop
It is just a metal plate with 3-4 tack welds. you have to get these off with a hammer and screw driver or something similar. My problem was with teh stock struts, removing these poped my struts. each of them. and i had to buy stock replacement macphersons in a pinch. so they were the same strut and they popped off just fine. so who knows.
5. now slide the spring perch on and adjust maybe mid way. slide the spring over and then the bearings on top of that.
6. place teh strut in the mounting location on the bracket and put the lower bolt in and thread the nut but do not tighten.
7 Now place the strut in the hole of the caster cambers and jack the a arm up so it compresses the spring. when the upper hole on the strut lines up with the bracket, thread the bolt in.
8. tighten both nuts and put the nut at the top of the strut just to hold it.
9. put the wheel on and let the car on the ground. the strut is going to push up through the car higher than normal and mine required some washers to get the correct tightness
you know the little bars that goes through the top bushing? well i cut that in hjhalf to align the rod through the bushing at the top of the caster camber. yes i know aftermarket casters will be different but i used stock. I didnt need casters since i had Front runners (skinnies)