90 integra GS questions

My g/f has a 90 integra GS and I was wanting to know alittle more about this car and whether its worth the time to invest time and money into. Im not looking to do too much, obviously the air intake and full exhaust w/ header. Is there anything else worth doing that doesnt break the bank? Im not looking for turbos or Nitrous just simple bolts on and similar.

You could drop it. "horsepower... for the curves" or whatever it is...