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2003 Impreza OBS
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Discussion Starter #1
Hey guys, I will be starting to mod my OBS in the spring. With the mods I have been considering (headers, test pipe, catback, intake and Delta 1500 grind), I've heard it'd be beneficial to reflash my ECU. After looking around for a bit, I found a site that says the 2003-2004 ECUs were not able to be reflashed. Since my car has the EJ251, shouldn't I be able to use an ECU from an older car?
 

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It will not work. I looked into that. There are 4 plugs in your car and 3 in the 02 jecs ecu which you could get a Crawford flash on. I now have an extra 01 ecu I can't get rid of. I have delta cams header and high flow cat and successfully run an aem fic piggyback which apparently nobody believes is possible. Lol. Btw you will detonate above 5k without retarding the timing with the 1500 cams. Trust me:cool:
 
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