You can use springs or coilovers. If it's a straight drag car just use really stiff springs in the back (you don't want the rear to sit)

Look into getting a tunable ECU (hondata, neptune, etc). Engine mgmt. is so important, and can always grow with you as you upgrade in the future.

There are other little things to look into. Injectors, fuel pump..if you have slicks at the track you need extended wheel studs...upgrade clutch. Deff. an expensive hobby