I'm thinking 25d block, 22e heads, cometic gasket, all with the ej18 intake so I don't have to touch wiring (that stuff scares me  ). Doing this for cheap power in my imp. Good or bad idea? Or maybe just throw a 25d block inbetween my heads. I just miss my power from my 2.5gt. 

I'm thinking your intake won't fit.

sure, go for it.  i bolted an EJ22 intake onto EJ18 heads, same bolt pattern, opposite components.

I'm thinking your intake won't fit.

I remember GD talking about how 22 and 18 heads were almost the same, is that not true? Or does it change with the phases 

Try it, worst case you have to move the harness off of the 18 manifold onto a 22 manifold. No cutting or anything, just unplug, move over, plug in.

More powah!!

Why the 1.8 intake? Do you have a 1.8 ECU? Can the injectors handle the 2.5..? 

Why the 1.8 intake? Do you have a 1.8 ECU? Can the injectors handle the 2.5..? 

I was hoping 1.8 intake because I was thinking for a 2.2 I'd have to do splicing or something. It's going into an impreza, so I have the ecu. And I'd imagine if I reset the ecu itself figure itself out

I'd be worried the injectors wouldn't keep up or the ECU would push them to near 100% duty cycle which could cause a burnout of the driver circuit or injectors, long term.

 

Compare the 2.2 or even the 2.5 injectors and see if they'd fit in the 1.8 rails or have the same ohm-spec. If so, I'd swap for the 2.2 at least and see how it runs.

 

Compare the 2.2 or even the 2.5 injectors and see if they'd fit in the 1.8 rails

the injectors will fit in the ej18 rails,

but i doubt they need to.

it will run fine on the ej18 injectors.

 

if the ej18 you now have is obd1,

then yes, stick with the ej18 harness.

i'm not sure about the intake it self.

 

plus you already have the ej18 intake / harness.

an ej22 intake / harness would cost you .

 

an easier , power upgrade, just swap in an ej22 (with egr).

simple and easy.

not the power of the ej25d,

but neither is the frankenmotor.

Actually the frankenmotor is supposed to have higher compression and more power than the EJ25D from everything I've read.

 

I'm not sure how using a 1.8l intake on that will affect it though.

I wouldn't expect the manifold to make a difference. Plug it together and drive. The EJ22 and EJ18 manifolds are nearly the same anyway.