RCZ

Here's a start (if you are in Miami, I have built cars for track use before for a small percentage of the amount spent, if you are interested):

1) Race Oil Cooler (possibly dual coolers)
2) Coilovers
3) Brake Pads
4) Brake Fluid
5) Brake Lines
6) 1.5way LSD
7) Diff Cooler
8) Light 18" Wheels
9) Track tires
10) Swaybars
11) Camber kit front and rear
13) Alignment


Lots more depending on how crazy you want to go, but I would say that's a good start with the basics at a modest starting cost ($6k installed for everything)