Only way you are going to get decent power from a DX engine is turbocharging, supercharging, or using a shot of nitrous oxide with upgraded internals.
Leaving the engine Naturally Aspirated and slapping some bolt ons will not give you decent power, maybe "decent" sound, but not power.
My suggestion? Look at the Complete Swapping Guide in this 92+ civic section, its a sticky, lots of engines to make your dx faster.
Own a R34? Post some pics, pretty cool.