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Old 01-08-2013, 04:31 PM   #17
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Member#: 108089
Join Date: Feb 2006
Chapter/Region: MWSOC
Location: Minnesota
2003 WRX
NF Performance


Originally Posted by jthatch12 View Post
Is an 02 ECU plug and play with 04? My initial thought would be no. The flash block isn't even similar. The 03 and 04 ECU flash blocks are identical. I'm not an expert at this but this would be my initial question OP
02-03 do share the same ecu even though the flash blocks are different.
You can install an 02-03 into an 04-05 and flash it.
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