stage 2 cobb
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This is a discussion on stage 2 cobb within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; So i have a 2004 wrx wagon with an axle back delete exhaust and am about to run a cobb ...

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    stage 2 cobb

    So i have a 2004 wrx wagon with an axle back delete exhaust and am about to run a cobb v2 accessport and i was gonna run stage 2 but it says that you need turboback exhaust to run stage 2. I am just out trying to find out if i can still run stage 2 with an aftermarket intake. my exhaust is basically off from 1 1/2 feet from the cat. I will have full turboback catless exhaust in the next couple months. I want to know if it is safe to run stage 2 until i get the exhaust.

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    MAINEiac 11blackSTi's Avatar
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    Stage 2 is not designed for the stock downpipe. You would want an aftermarket downpipe, and if you run COBB it needs to be high flow cat not catless. You can run a stage 2 with an intake on as long as you run the intakes that are supported by COBB.

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    I understand the difference between catless and high flow cat but why cant it be run with catless down pipe? and why does it have to be cobb approved intake?

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    MAINEiac 11blackSTi's Avatar
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    Quote Originally Posted by shavman4 View Post
    I understand the difference between catless and high flow cat but why cant it be run with catless down pipe? and why does it have to be cobb approved intake?
    Because that is how the COBB maps are designed. On a WRX there is a large difference between catted and catless maps. Catless maps should be pro-tuned. The intakes have a large difference in MAF scaling, which can lead to catastrophic events if you are not properly tuned for.

    I believe COBB only supports AEM and COBB intakes.

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    This is what Cobb states about an off-the-shelf Stage 2 tune:

    https://static.cobbtuning.com/cobbtu..._WRX_02-05.pdf

    (They don't list support for the AEM intakes until the 08 model year.)

    Nothing specific there about needing a catted downpipe. I suggest that you contact Cobb if you want their recommendations. I've gotten good email responses from them for submissions from their web site.

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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    The catted down pipe requirement is for 2006+ wrx (2.5l)

    The 02-05 doesn't mention being catless vs catted

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    MAINEiac 11blackSTi's Avatar
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    My bad, i didn't realize they were different for the first gen!

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