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Old 11-20-2012, 11:23 AM   #1
Scooby Newbie
Member#: 152010
Join Date: Jun 2007
Location: Upstate NY
2004 Forester XT 5sp

Default Straight Swap? 98 Impreza 2.5 Motor Into A 98 Legacy 2.5?

From the little bit of digging that i have done i found that the engine code for the Impreza is ej25(1)? and the legacy is the EJ25d? will the wiring match up exactly ect ect?

Im not a new mechanic, im just looking to see if it will bolt straight in, will i have to swap harnesses, clutches for FW ect ect.

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Old 11-20-2012, 01:39 PM   #2
Patrick Olsen
NASIOC Supporter
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
1997 Legacy 2.5GT
QuickSilver Metallic



The '98 2.5RS should be an EJ25D (DOHC) as well, not an EJ251 (SOHC). The 2.5RS shifted to the SOHC engine in '99, while the Legacy and Outback switched over in '00.

If you're getting another EJ25D, the engines should be essentially identical. I put a '98 2.5RS engine in my 2.5GT back in '06 and there were a couple of differences on the intake manifold:

I just swapped my 2.5GT intake manifold onto the 2.5RS engine so I didn't have to worry about the differences. There shouldn't be any other changes - clutch and flywheel are the same, harness and all the sensors are the same, etc.

If you're looking at an EJ251, then it will not be a straight swap. The "easiest" way to use that engine in your '98 Legacy would be to put the EJ25D cylinder heads, intake manifold, sensors, etc onto the EJ251 short block.

Pat Olsen
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Old 11-20-2012, 03:42 PM   #3
Scooby Specialist
Member#: 111565
Join Date: Apr 2006
Chapter/Region: W. Canada
Location: Winnipeg
1999 Legacy 2.5GT
2007 Legacy GT Spec-B


Hey Ken, if it is indeed a 98 Impreza 2.5rs engine then it will swap in without any issues. What type of problems are you having that you need to replace your current engine?

Originally Posted by Patrick Olsen View Post
Hey Pat, what is this? I don't have anything that resembles this in my 99
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Old 11-20-2012, 01:45 PM   #4
Scooby Newbie
Member#: 152010
Join Date: Jun 2007
Location: Upstate NY
2004 Forester XT 5sp


ok im more sure about the years of the cars than im about the engine code of the engines.

I was told 98 Impreza 2.5 to 98 Legacy 2.5

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Old 11-20-2012, 06:13 PM   #5
Scooby Specialist
Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
56 Belair
Pro Street


charcoal canister. these were relocated to the rear of the car post 98.5
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