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Old 07-21-2010, 05:41 PM   #1
Scooby Newbie
Member#: 240419
Join Date: Mar 2010
Chapter/Region: NESIC
Location: Rochester, NY / Philadelphia
2004 WRX
World Rally Blue

Default 2004 WRX, 05 LGT Block + 05 STI head... need help

Ok so long story short, blew the engine in my 04 WRX.

So far I have a EJ255 05 LGT block and was looking at buying a very clean pair of 05 EJ257 STI heads for cheap.

My question, what am I getting myself into? I have been doing research on AVCS and I am scared and confused. First of all, would the ECU hook right up? The guy I bought the block from worked at a dealership, he said that I would be able to reflash the ECU. I was looking into it and a flash from a 06-07 WRX would be most compatible engine wise...

I'm looking for input, is it as easy as i think? Starting to think not.
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Old 07-21-2010, 11:51 PM   #2
Scooby Specialist
Member#: 74006
Join Date: Nov 2004
Chapter/Region: TXIC
Location: Dallas, TX
2005 9-2x


You cannot just flash your ecu. You will need complete wiring harness and ecu from a car with avcs or a stand alone ecu that you can wire avcs on your own. Either way it's not simple.
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Old 07-22-2010, 08:01 AM   #3
Scooby Specialist
Member#: 126696
Join Date: Sep 2006
Chapter/Region: SWIC
Location: las vegas
2002 Fatbody bugeye
03 R1 09 Raptor 700R


If you searched so hard why didn't you get half way down the page to the EJ25x swap guide?
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Old 07-22-2010, 12:53 PM   #4
FuJi K
Scooby Guru
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
MY99 GF4 JDM 6spd
NF Performance


Ahahahahaa you so funny.

You don't have to run AVCS. Just leave the solenoids unplugged. It's not like it's going to not run. sheesh... people. Just install your intake manifold on it and go get a tune for the different loads and such to match your setup.
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