nothing... except possibly struts if you have a lot of mileage on your stocks or you plan on slamming your ride
Not really my frend.
You will need at list an alighment kit for the front. You can use Eibach alighment kit YOU CAN GET IT HERE.
Rear... You can use your stock camber plates or you can get Hotchkins kamber links $240... But it's not a big deal.
You can also change your shocks. Best shocks for Eibach sportline springs are Eibach or Tokico...
P.S.Just let you know that w/o an alighment kit on the front Alighment shop will not do the alighment.
P.P.S. And yeah you can get the Sportlines for $185 FROM www.MODACAR.COM