how poorly will my car run...?
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  1. #1
    0bhp 3G Impreza callktulu's Avatar
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    Question how poorly will my car run...?

    How poorly will my 2015 Limited run if I replace my downpipe with a catless pipe, but I don't reprogram the PCM? Will the computer adjust on its own, or will it run horribly until I flash a new program that accounts for the lack of a catalytic converter?

  2. #2
    0bhp 3G Impreza 2e1x1farmer's Avatar
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    The ECM will not adjust to whatever mod you add. I strongly suggest you retune it when adding the new mod. These things are very finicky unfortunately.

  3. #3
    0bhp 3G Impreza ETNWRX's Avatar
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    The one thing with these vehicles (WRX’s and STi’s) are that the ECU is very precisely balanced from the factory (albeit very conservatively). Any change, other than a panel filter results in the need for the ECU to get flashed.

    I really recommend researching and reading up on all things 2015+ WRX. You won’t go wrong learning everything you can about these vehicles. I had my plan all but erased after reading articles and videos of what can go wrong on certain mods.

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  5. #4
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    Hoonigan808's Avatar
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    read the signature.
    08WRX, TP Stage2, "Thou shalt not go stage 2 if thou hasn't installedeth a downpipe, unless thy wantest a checketh engine light. Lo, thou who installedeth a downpipe and has not tunedeth to stage 2 shall face thine engine's wrath, for thy dash shall become illuminated and proclaim "Hark, thou hast slain me", so sayeth the ECU."

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