questions/tips for my 2004 wrx small upgrades.
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This is a discussion on questions/tips for my 2004 wrx small upgrades. within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; I just want to do some small upgrades to my 04 WRX like a full exhaust and cool air intake ...

  1. #1
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    Talking questions/tips for my 2004 wrx small upgrades.

    I just want to do some small upgrades to my 04 WRX like a full exhaust and cool air intake and little things like that. I found a guy that has a brand new STI turbo he will seal me will it bolt up to my existing stock manifold? And names of good slightly cheaper performance parts will help! Thank you!

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  3. #2
    Master Baiter EJ257's Avatar
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    You'll need to modify the ECU mapping for the exhaust.

    You should get a catless uppipe (no tuning needed, just a resistor to get rid of the DTC associated with the EGT sensor you remove). The stock catted one is a blown turbo waiting to happen, when the cat shreds apart and gets sucked into it.

    You're fuel-limited to your stock turbo; you cannot upgrade turbos without also addressing the fuel injectors and pump.

    A CAI will require additional tuning, as the MAF scaling will have to be adjusted.
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

  4. #3
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    Thank you for the help!! Now I know where to start!!

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