Save your money man. With $100 you are not going to get any worthwhile "mods" done. I can think of a few things around $100. So, if you really have the itch...
1. Cold Air Intake ($83)= http://www.grandprixforums.net/threa...derwell-intake
2. 1 set of poly motor mounts and 1 set of poly dog bushings ($70)
3. TransGo shift kit & Trans Filter & Trans Fluid ($70-100)
4. Trailing Arms ($50-100)
5. ZZP rear sway bar ($100)
Other odds and ends could be thrown in here. Good Luck.