well, for the 12s youll need at least headers, rockers, a FANTASTIC tune, the correct pulley, and enough traction. you can do it without a cam or intercooler, but you need to know how to drive the car very well and you need a spot on tune.
i am adding meth injection and e85 (~105 octane fuel) on top of basically what i just told you and am hoping to run a high 12 on street tires.
i would start with an intake, plugs, thermostat, and whichever set of headers you want to pick. that'd bring you to an easy 3.4 pulley area with a good tune. from there it is up to you to go with a cam or an intercooler. an intercooler is basically the best mod for this car that you can buy, but without a few breathing mods youll end up running more boost than you want if that is all youve got.
from here youve got a bunch of choices on which parts you want..i suggest used or home made to keep your wallet fat.