I have been workin on my 93 del sol SI and done the following mods:
CAI
4-2-1 Header
2.5" Piping to exhaust
Highflow Cat
10mm sparkplug wires
MSD Controller, cap and coil
Hyperground System
Run 93 octane

And its fast and all, but still not quite fast enough to hold me over till I can afford a dohc swap.

What else can I do to get the most outta my d16z6 sohc vtec engine?

Bigger injectors? I dont want to put NOS or turbo this engine. I will save my money on a turbo for now since it seems that it will not fit a dohc if i get a sohc turbo.

I finally realized that my car was not up to par when I finally recently raced someone. They were driving an Acura that looked kinda newwer but since it was a good deal bigger than my sol I think I shoulda taken him no prob since as far as I could tell it was stock. What engine do acura's generally have? the acura looked kinda like this: http://www.milemate.com/pictures/acura%20rl%202002.jpg but it was a 2 door. when we (kinda) raced (after turning from a light) he came up from behind me quite quick so I floored it (i could tell he wanted to race) and beiing in second gear at around 3k rpm i thought i would take off pretty good. around 6k rpm where my car pulled the hardest he was slowly pulling on me. But as we came up on traffic we quickly gave up the "race" But im pretty sure in a normal race he woulda won. This has been the only car I have raced so far (not much of a race I know) but it gave me an idea if I could compete a little. So now im not happy with my mods and need to keep modding so I need advice from the pros. (leave SA comments out please)

I know this story sounds stupid cuz i coulda lost to a "stock" car but it was only a half-assed race but from this I determined that I woulda lost. So I need more ideas on hp gains.