07 Sti 540cc injectors in MY04 WRX?
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This is a discussion on 07 Sti 540cc injectors in MY04 WRX? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Curious, I plan on undertaking a huge project this Summer with my 2004 WRX sedan. I'll cut to the chase. ...

  1. #1
    Registered User MisterNBG's Avatar
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    07 Sti 540cc injectors in MY04 WRX?

    Curious, I plan on undertaking a huge project this Summer with my 2004 WRX sedan. I'll cut to the chase. I want to add a few STi engine parts to my car. More specifically, the VF39 turbo and some STi injectors. I understand there's a lot more parts that need to be added don't worry about that, but I was curious if factory 540cc injectors from an '07 STi would fit in my 2004 WRX? I can buy them right now for $125 and was curious if it was worth it or not

    Thanks fellow gear heads!

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  3. #2
    Moderator Donkey's Avatar
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    Yes they will fit as they are the same injectors the 06+WRX uses,but you will need to adjust the injector scaling in the ECU's ROM.
    Resident Adviser @ WTF Tuning, LLC
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  4. #3
    "Supreme Subaphile Extraordinairre" ninefourteener's Avatar
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    07 STI = Side feed injectors
    04 WRX = Top feed injectors.

    Your injectors will not work.

    Your turbo and intercooler will.

    You will need at least a set of 550cc top feed injectors, a fuel pump, and a suitable exhaust.

    Oh yea.... and a tune.
    2006 Subaru WRX-Thread: http://www.clubwrx.net/forums/engine-modifications/165158-ninfourteeners-progress-thread-pics.html
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  5. #4
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    2007 STi injectors are top feed...
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    Good news, everyone!

  6. #5
    "Supreme Subaphile Extraordinairre" ninefourteener's Avatar
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    Quote Originally Posted by Anub1s View Post
    2007 STi injectors are top feed...
    You're right..... my mistake. STI injectors were side feed from 04-06. I forgot they switched to top feed in 07.

    Good catch.
    2006 Subaru WRX-Thread: http://www.clubwrx.net/forums/showthread.php?t=165158
    1978 Subaru BRAT-Thread: http://www.clubwrx.net/forums/engine...ss-thread.html
    2007 Subaru B9Tribeca Ltd (PSM)........1994 Subaru SVX LSi(SOLD)
    WRX 12 sec drag (vs. late model Camaro SS):http://www.youtube.com/watch?v=lw0vWdD2cjU
    WRX track racing (catching a stg.2 WRX): http://www.youtube.com/watch?v=mELeSD1Mi08
    Co-Founder/retired Admin-www.slcsubaru.com

  7. #6
    Registered User MisterNBG's Avatar
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    Quote Originally Posted by ninefourteener View Post
    07 STI = Side feed injectors
    04 WRX = Top feed injectors.

    Your injectors will not work.

    Your turbo and intercooler will.

    You will need at least a set of 550cc top feed injectors, a fuel pump, and a suitable exhaust.

    Oh yea.... and a tune.
    Lol thanks, I know why I need to get, I just didn't know about the injectors. Thanks for the help dude!

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