I keep seeing to use an si harness for plugs. My question is if I can find a 91 EF ex will that harness plug directly into my 91 EF DX harness or is it the same thing as the si harness where I just need plugs off of it? Or will any d16a6 work for example 92-95 they are in abundance at pick apart.

 

Any of the plugs will work from a MPFI motor. You have to modify your DX harness though. The Si or Ex harness will not plug into the harness at the shock towers.

 

Thank you, that's what I needed to know

 

Very easy to do. There are companiesthat sell plug n play harnesses for like 160 but if you run new injector wires and the 2dizzy wires the rest is just extend wires and solder a new dizzy plug