as far as the biggest differences in change in suspension are as follows:
-Coilovers/ Shock&springs
a stiffer than OEM replacement will offer you a completely different car when properly changed.
-Sway Bars
A small note on upgrading sway bars, is that these bars will affect the way the rest of your car works. Sway bars basically independent movement of the lower control arms when turning. This in part helps lower roll on a car. A small note is that by decreasing less roll, your shocks/springs as well as tires will be force to take the heat.
-Tires/Rims.
This is the biggest one to change. A selective size tire will help handling and braking. Say you have 185/60/14 and you upgrade to 195/50/15 rims. This will benefit the car as it has increase it's tire patch by 10mm which is almost half an inch on each corner! Also note that Tires and rims have a limit.. a 20inch rim will not increase your handling.. for civic egs I say 15-16 lightweight rims and running 195 (roughyl stock power) to around 215 is the maximum for optimal handling.
I can go wayy more into depth but i'm too lazy right now. I love educating.
