Quote Originally Posted by speedminded
The "coil-over" sleeves are just a threaded aluminum...does not matter who makes it as long as they thread properly. The spring does matter to a point, do you know the difference between a progressive and linear spring?

The most important part is the shocks. The point of UPGRADING suspension is to have the shocks (dampening/rebound) matched to the spring rate. A stock shock with an upgraded/stiffer spring will ride like crap.
thanks man that was a ton of help. and nope i dont know the difference lol