Ok, i know this is areally stupid queston, i've just never had to deal with it before. Is a '90 CRX Si DPFI or MPFI? i ask because i'm looking at instructions for a mini-me swap and its talking about it.
It is easy to figure out by looking at the engine too.
The MPFI (multi-point fuel injection) has 4 injectors all in the intake manifold. You can see them easily. The DPFI (dual point fuel injection) has 2 fuel injectors that are mounted in a carb like box that sits on top of your intake manifold.
If you need any mini-me help, downest and I just completed the swap. I used a Z6 head and downest used a Y8 head.