exhaust, good heads, some VTEC :p, nice cam.
if you wanna go all out, you can get cam, ported heads, larger valves, new pushrods, new valvesprings, good set of 1.73RRs and a great dynotune. you should still be able to make power to 6000rpms. that would get you some good top-end power.
top end is where you need every bit of incoming air out of there w/o bottlenecking up
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**