In this picture top, if you look at the corner of the bumper you'll see a hole in it. It goes all the way throught the metal exposing the cone type air filter to the incoming air.
The red wire had to be added from the distributor to the ECU connection wich has an empty space for the new wire.         
The air intake pipe is straight from the throttle body to the air flow meter. I pushed the battery all the way back by cutting the battery tray. The pipe is 2.5 inches diameter. This is only a prototype.
The RX-7 air flow meter with a 3 inch adapter to the cone filter.
In the pictures above, the VICS solenoid (left with white plug) as to be connected to the ecu as well. The other solenoid works with the fuel presure regulator. The brown connection or plug for this solenoid (right) comes in the 323's wiring harness already, you just need to plug it in. 
UPDATED   08-19-03

I only used the DOHC injectors and its fuel rail  with my 323's harness, so that way I can still use the 6 wires plug (the Protege has 8 wire plug) You'll also have to add another plug (white) for the VICS wich comes with the DOHC engine in the intake manifold and just pull current (juice) from the brown connector that already comes with the 323's harness  (extra). This brown connector was useless with the 1.6L system but with the DOHC you'll put it to work in the fuel regulator solenoid (wich comes with the DOHC intake manifold as well). I belive that the 323's harness is identicall to the Protege 1.8L SOHC which happens to have a fuel pressure reg, solenoid. Another thing that comes to mind, the  Temp Sensor in the 1.6L is in the Intake Manifold. On the DOHC it is located by the termostat housing. They have the same type of connection (you'll know wich one it is, green color)   You'll need to( pull the existing plug all the way to the thermostat housing) or cut and add a wire from the 6 wires plug that connects the water temp sensor, (these come from the computer to the fuel rail), and connect it to the W.T.Sensor by the thermostat, this way the ECU will have a Water temp sensor signal. Here you only have to modify the harnes a little. Basicaly you only need to add two wires. One from the VICS to the ECU connection wich has an empty space for them and one from the distributor also to the ECU.
UPDATED  08-28-03
WIRES TO THE ECU FROM THE ENGINE BAY

The ECU has two connections. One long (to the left) and one alittle shorter (to the right) looking at it connected,.you only need to work on the longer one.
First, you have to run a wire from the distributor to the ecu, Now, do the same thing with the VICS. Run a wire all the way to the ECU from the VICS solenoid. The solenoid connector has a white and red wire, same as the fuel pressure solenoid plug, (which is right next to it) so what you want to do is pull current from a white and red wire so that the VICS solenoid can have current all the time. (I pulled current from the fuel pressure regulator solenoid, Once you've connected the VICS white and red wire, go to the ECU and do the following:

On the longer connector(left), on the top raw, from left to right, count 4 holes, there should be no wire there, insert the wire that comes from the VICS solenoid, (I drilled the hole a little bigger so I could fit the wire under pressure, I didn't have any connectors or pins to connect it to the ECU), just push the wire in.
On the same connector, on the same top raw, from RIGHT to left, count 4 holes, there should be no wire, that's for the G signal coming from the distributor.