What mods to you have to your RSX?
For stock Integras, I know folks have been able to lean out the fuel curve for more top-end power. From what I understand, the Integras came running rich from the factory for safety reasons, so you could tweak a few extra whp just by tuning.
However, the few whp gained isn't really worth the money required for dyno time (again, on a stock car). Of course if you have some bolt-ons or other free mods then it's an entirely different story.
Shingo