I'm looking to buy a 2002 Impreza with a blown 2.0 liter turbo engine. I want to know if I can put my 2.5 SOHC engine from my 2000 OB Sedan into the Impreza easily or will a wiring harness exchange be in my future. If so-I ain't doing it. I guess that's more than 1 question. My skill level is about a 7. I could do the wiring harness, but I fall short of changing pins in connectors. What do you'll think? Can I do it?

Way too many differences between turbo (2.0) and non-turbo(2.5). You'd have to swap the entire harness and then some and there may still be things that wouldn't work.

The better option would be to swap in the 2.5 block but you'd need to put a set of low compression pistons in it or it would kerplode itself too.

 

Just too much work to do a swap. Look for a good used 2.0 long block instead.