* Always Align Car After Lowering *
I see this question asked quite a lot. Often times people want to lower their car or put on new springs, struts or coilovers and simply they don't have enough information on making the correct decision.
Here are the simple answers to help you.
Coilovers
These are a combination component. They contain springs, struts (integrated) and have the ability to adjust ride height and often times the rebound and dampening characteristics of the shocks. When you are looking for the ultimate in ride height adjustability and true all out performance for the street and the track, this is what you buy. When you buy coil overs, you do not need to buy springs or struts, you have it all!
Springs / Lowering Springs / Lowering Kit
These terms are most often associated with the springs only and are used for lowering (to a fixed height as they are not adjustable). If all you want to do is lower your car and gain some basic cornering performance this is all you need.
Struts / Shocks
These two terms are basically interchangeable. The struts are the part of the suspension assembly that you see is fitted INSIDE the springs. You would typically purchase new struts when your are leaking oil or just worn out. You would also typically purchase new struts when you buy lowering springs (unless your car is quite new).
I HOPE THIS HELPS