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Old 02-13-2015, 02:02 PM   #75
Scooby Specialist
Member#: 335135
Join Date: Oct 2012
Chapter/Region: NWIC
Location: PDX
2007 WRX
WRC blue


My memory when I was researching swapping an EJ255/57 into my old Forester was that you needed:

-Matching immobilizer and key
-Ignition with antennae for chipped key
-Roll connector that fits your car (the 04 STi had a single stage airbag and the 05+ had a dual or something, I can't remember the exact reason but for older Subaru's they tended to be single, so the 04 STi was the only choice or an 06-07 WRX IIRC)
-AVCS wiring harness and harness merge from I-wire or someplace like that
-Drive by wire throttle body
-Drive by wire gas pedal
-AVCS oil lines, they aren't all the same as the non AVCS heads

My personal opinion after looking over the possibility of using AVCS on that project for over a year or two was that the added wiring and cost to include AVCS was no where near worth the very minimal gains that AVCS seemed to show vs a long block EJ25 swap or a hybrid EJ20/25. I compared dozens of dynographs on EFI Logic and Cobb's dyno databases and really could not see an appreciable difference anywhere, and considering the extra parts and wiring adds about 1500 in cost it's money better spent elsewhere IMO.
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