cpe intake (400-500 depending if you want tunable version or not)
s/c (1500??) [not to mention upgrading fuel lines, etc if you want to bump up psi]
turbo (whole lot more money because you need forged internals) (A LOT OF MONEY)
solara isn't really a performance car BUT..
upgrade the suspension..!!
lower it, with tein or eibach springs, tokico struts. (450-700?)
or get Tein coilovers or JIC Magic coilovers (coilovers are fully adjustable, unlike lowering spring/struts). (1200-1600?)
also, get RSB (rear sway bar) best bang for your buck. Reggie (username: NVDIS1) can hook you up for cheap. (150 shipped, around there)
rims too are a good idea, and get the lip kit. (600 dollar pep boy rims or 3000 dollar volk gt-n's

)
Kevin (username: Xavier) can hook you up, since this is a discontinued item from way back, this will set off the look of your car. (670+ shipping)
if you want exhausts, look into a trd exhaust or greddy evo2 (if you can find them) otherwise, get it custom done. (30 dollar autozone exhausts or up 400+ catback?)
Shave your emblems,everything is better shaved.
get some tint, privacy, eh?

(150-300)
I think thats about it for the most part..
search around next time, and oh yeah..
welcome to the forums, im going back to sleep.