I'd suggest the following.
A C&L or JLT2 cold air intake and a SCT tuner from either Brenspeed or Bamachips, that'll net you a solid 25-30HP and sets the stage for the whole thing.
After that some Steeda UDP and some CMCV plates will really round out the power quite well.
You can do mufflers but really the gains HP wise are nill, it's more sound than anything.
For gears, a manual car I'd say 4:10s, if it's auto 3:73's are generally good enough though some of the more hardcore say no less than 4:10's for anything but I and a bunch of others disagree. In fact if you plan to supercharge most places say 3:73's are about all you should change to or you really risk just blowing the tires off when you launch.
And if you do all that above and are drag racing, some drag radials would likely be a very good idea as your car will be going pretty damn quick, some BMR or Seeda lower control arms would be a good idea too at this point.