2006 Impreza Swap

rusttykrabz · 03-21-2024, 01:24 PM

I am a noob. I have a 2006 Impreza Wagon N/a that belonged to my late little brother. I've been wanting to do an engine swap for him. My step dad is a mechanic and me and him are gonna be doing the work on it.

I found a 2004 forester XT as a donor that has a couple STI mods already done to it. Would this engine and other parts work in a swap? They are both the 2.5s.

Any help would be appreciated.

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Jack · 03-21-2024, 01:38 PM

If you buy the entire Forester, you may have everything you need. The easy way is to pull all the stuff out of the Forester and put it into the Impreza. This includes the ECU and harness and crossmember and exhaust. The exhaust would likely need some merging or modification but any exhaust shop should be able to do this.

rusttykrabz · 03-21-2024, 01:41 PM

Yeah it already has the STI intercooler and the STI wheels. It has the carbon fiber hood as well but i dont think that will fit haha

rusttykrabz · 03-21-2024, 01:52 PM

Would I need a new tranny? As the Impreza is a stock manual 5 speed and the forester is a 5 speed automatic?

monkeyposeur · 03-21-2024, 04:25 PM

You can use the stock 5mt in the impreza. Just know it might not hold up with the increased power levels forever. From what I remember you leave the Forester TCU plugged in and maybe do some wiring stuff with the speed sensor or neutral safety switch. I know that people on RS25 would do wrx swaps but keep the RS transmission. Probably not as ideal as swapping in a wrx transmission but do what you gotta do. Just know you might be swapping out the transmission later when it breaks. Also keep in mind the hydraulic vs cable vs push/pull types of transmissions. But the RS transmission will bolt right up to the Forester engine.

Look into seeing if iWire provides a wiring harness for this swap. It will make your life a lot easier.

rusttykrabz · 03-21-2024, 04:52 PM

Yeah I have already put an inquiry in with iWire!

Heroic28 · 04-16-2024, 11:18 PM

I’ve got an 06 Impreza sedan swapped via an 06 wrx wagon for reasons similar to yours, totally worth it man. It’s hard to tell exactly what you'd need because i pretty much swapped everything, and I’m not sure what things will carry over from the forester,

There’s a write up of a swap on here from someone that listed everything he needed to buy to make it happen. Maybe for the right price you could find a donor 06-07 wrx or Sti, hope this helps!

Heroic28 · 04-16-2024, 11:25 PM

https://forums.nasioc.com/forums/showthread.php?t=2196559

coryb03 · 06-06-2024, 03:50 PM

following

03-21-2024, 01:24 PM	#1
rusttykrabz Scooby Newbie Member#: 537133 Join Date: Feb 2024 Location: New Mexico Vehicle: 2006 Impreza Wagon Silver	2006 Impreza Swap I am a noob. I have a 2006 Impreza Wagon N/a that belonged to my late little brother. I've been wanting to do an engine swap for him. My step dad is a mechanic and me and him are gonna be doing the work on it. I found a 2004 forester XT as a donor that has a couple STI mods already done to it. Would this engine and other parts work in a swap? They are both the 2.5s. Any help would be appreciated. * Registered users of the site do not see these ads.

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03-21-2024, 01:38 PM	#2
Jack Add Lightness Moderator Member#: 13699 Join Date: Dec 2001 Chapter/Region: NESIC Location: Hopkinton, MA Vehicle: 2021 Building It Better	If you buy the entire Forester, you may have everything you need. The easy way is to pull all the stuff out of the Forester and put it into the Impreza. This includes the ECU and harness and crossmember and exhaust. The exhaust would likely need some merging or modification but any exhaust shop should be able to do this.

03-21-2024, 01:41 PM	#3
rusttykrabz Scooby Newbie Member#: 537133 Join Date: Feb 2024 Location: New Mexico Vehicle: 2006 Impreza Wagon Silver	Yeah it already has the STI intercooler and the STI wheels. It has the carbon fiber hood as well but i dont think that will fit haha

03-21-2024, 01:52 PM	#4
rusttykrabz Scooby Newbie Member#: 537133 Join Date: Feb 2024 Location: New Mexico Vehicle: 2006 Impreza Wagon Silver	Would I need a new tranny? As the Impreza is a stock manual 5 speed and the forester is a 5 speed automatic?

03-21-2024, 04:25 PM	#5
monkeyposeur Scooby Specialist Member#: 333468 Join Date: Sep 2012 Chapter/Region: RMIC Location: SLC, UT Vehicle: 93 SS - 06 OB XT 03 WRB GD 205/22T 20G-XT	You can use the stock 5mt in the impreza. Just know it might not hold up with the increased power levels forever. From what I remember you leave the Forester TCU plugged in and maybe do some wiring stuff with the speed sensor or neutral safety switch. I know that people on RS25 would do wrx swaps but keep the RS transmission. Probably not as ideal as swapping in a wrx transmission but do what you gotta do. Just know you might be swapping out the transmission later when it breaks. Also keep in mind the hydraulic vs cable vs push/pull types of transmissions. But the RS transmission will bolt right up to the Forester engine. Look into seeing if iWire provides a wiring harness for this swap. It will make your life a lot easier.

03-21-2024, 04:52 PM	#6
rusttykrabz Scooby Newbie Member#: 537133 Join Date: Feb 2024 Location: New Mexico Vehicle: 2006 Impreza Wagon Silver	Yeah I have already put an inquiry in with iWire!

04-16-2024, 11:18 PM	#7
Heroic28 Scooby Newbie Member#: 512514 Join Date: Mar 2020	I’ve got an 06 Impreza sedan swapped via an 06 wrx wagon for reasons similar to yours, totally worth it man. It’s hard to tell exactly what you'd need because i pretty much swapped everything, and I’m not sure what things will carry over from the forester, There’s a write up of a swap on here from someone that listed everything he needed to buy to make it happen. Maybe for the right price you could find a donor 06-07 wrx or Sti, hope this helps!

04-16-2024, 11:25 PM	#8
Heroic28 Scooby Newbie Member#: 512514 Join Date: Mar 2020	https://forums.nasioc.com/forums/showthread.php?t=2196559

06-06-2024, 03:50 PM	#9
coryb03 Scooby Newbie Member#: 228493 Join Date: Oct 2009	following