I got a 93 prelude si w/ h23a motor with some basic bolt ons - Intake, DC headers and cat back, centerforce clutch, Fidanza 8 lb. flywheel. Whats Next? Besides a turbo (which i'm saving for) what other mods can I invest in for good hp gains?

 

cams, engine management, or some msd spark

 

well you have to look at it with the future in mind...
If you are going to go down the FI track in the future then ther is no point in wasting your moeny on bolt ons now.
My suggestion would be to save for a good engine management system, something that might give you a couple of extra HP now, but that can be retuned later down the track to accomodate a turbo setup.
Also the MSD 6AL would be a good addition, or perhaps a brake upgrade? Even largers injectors, and a fuel pump. All of these things are good additions to any car, but they will really come into their own when you turbo.

The point is if you are going to go and buy things like cams you will probably find yourself replacing them when you want to run a boosted application.
Plan in advance- it'll save you a heap of $$$ in the long run.

 

As far as engine management systems, what should I be looking for? About how much for buy one and install? What kind of returns will I see w/o boost?

 

well you could help all those other bolt on get the power to the ground. what about a Quafie diff. They are the best. Don't go for the phantom grip crap, cause that is exactly what they are. mine decided to take a **** on me one day.