suspension

well for starters do you want to lower the car ? if so that would be great cause it lowers the center gravity on your car so when your takin curves at high speeds the body will not roll so start with that . for the rear suspension you can do this , lowering springs , adjustable panhard bar ,lower and upper control arms ,shocks, and rear strut tower brace to top it off . for the front you can do this , lowering springs , struts, strut tower brace , caster camber plates , front lower control arms , and for both front and back add eibach anti-roll kit that should cover all your suspension if anything is missing someone chime in :)
 
the first thing your gonna wanna do is get some gt take off sway bars big improvement and its only around 120 bucks. or if you want to spend more get some after market ones thats the easiest thing.