I Just put on a body kit on my 97 4 door Integra and I'm looking at adding some Horsepower to the engine...what are some ideas taht aren't really expense but worth doing...i have an intake in right now so i'm around 155 hp...any ideas are great!

One cheap mod would be gut your converter it gives less airflow restriction

I don't think you have 155 with just an intake unless you have a gs-r.

140 stock with an full ram intake...

140 stock with an full ram intake...
sorry, but you don't have 155 hp, except maybe flywheel hp. Just because the manufacturer says 140 hp doesn't mean that it is 140 whp. You probably have maybe 110 or 120 hp + 5 from the RAI. that makes around 120whp.

now, back on topic....

one cheap mod is a new rear section exhaust, although you will not gain as much as a cat back.

You have an LS right? just go for the usual bolt on's first like Headers and exhaust. then get urself some cams to get some serious/noticiable HP gains