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Old 01-15-2006, 11:48 AM   #1
Scooby Newbie
Member#: 103392
Join Date: Dec 2005
Location: Houston
Question replacing blown 03 wrx motor with 04 motor (plug and play?)

My 03 wrx motor (mt) is blown and I have access to a 04 wrx motor (mt)sitting in a salvage car. What is the best way to swap these motors? Just replace the block and head, or the entire motor, do i need to change the wiring harnesses, and what about the computer, do I use the 04 or 03? Does the 04 motor have additional sensors? I want the car to behave perfectly, and I want to eventually run a cobb accessport on the ecu. Any feedback/help on this swap would help.

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pillarguy17 is offline   Reply With Quote
Old 01-16-2006, 12:51 AM   #2
Scooby Specialist
Member#: 49465
Join Date: Nov 2003
Chapter/Region: Tri-State
Location: NY
03 Bugeye Wagon


its all depends on you.. do you want to run on 04 ecu or 03 ecu? i don't see the difference between the two.. swap the whole drivetrain out.. including the tranny.. i think they're just tuned differently.. check the wiring on both years.. and check both of them have all the same sensors.. before you make a move.. if they're the same.. just unbolt the mounts and swap out the whole thing.. good luck..
taeyax82 is offline   Reply With Quote
Old 01-16-2006, 12:58 AM   #3
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Member#: 102779
Join Date: Dec 2005
Location: JDM land filling a container
1998 PM if u need
JDM bits.....


gearboxes should be identical. run the 04 gearbox only if the 03 is toast.
motor should be close to pnp, if th harness isnt, just swap over the engine harness from the 03.
swapstar is offline   Reply With Quote

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