3" flat flange to 3" donut flange exhaust adapter?
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This is a discussion on 3" flat flange to 3" donut flange exhaust adapter? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; All I can find, i.e. Grimmspeed, CNT, are the adapters that are 3" to 2.25" or 3" to 2.5" I'm ...

  1. #1
    Registered User unknownally's Avatar
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    3" flat flange to 3" donut flange exhaust adapter?

    All I can find, i.e. Grimmspeed, CNT, are the adapters that are 3" to 2.25" or 3" to 2.5"

    I'm trying to mate an HKS downpipe to an Apexi GT Spec catback and do not want to get any welding done.

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  3. #2
    Registered User wreckingball man's Avatar
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    Pics of the two flanges would be helpful.
    I'm assuming it's a flat 3'' flange on the HKS and a concave 2.5'' on the Apexi?

    3'' HKS==| )==Apexi 2.5''

  4. #3
    Registered User unknownally's Avatar
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    3" flat flange to 3" donut flange exhaust adapter?




    So the Apexi is 2.5"?

    Also, with the Grimmspeed or CNT adapter, can I use flat gaskets on both sides? I don't have any donut gaskets or spring bolts.


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    Last edited by unknownally; 12-10-2013 at 01:34 AM.

  5. #4
    Registered User wreckingball man's Avatar
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    Yes, that pipe is 2.5'' or maybe less. Can't tell from the angle of the camera. Honestly, I have the exact same thing going on now (a 3'' downpipe and the stock midpipe which is 2.5''). I just put the donut gasket in there, tightened the spring bolts, and didn't need an adapter. However, I'm sure the right way to do it would be to buy the adapter.

    To answer your question, this is coming straight from the 'question' section on the product page:

    "Are two (2) gaskets required, one on each side, when installing this (adapter)?"

    "Yes, you will need an OEM Donut Gasket and a 3" 2 Bolt gasket. RallySport carry's both of them." -Justin from Grimmspeed
    http://www.rallysportdirect.com/Grim...rce=GoogleBase

  6. #5
    Registered User unknownally's Avatar
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    I appreciate your help!
    Ugh, I can't find any info!
    Where can I get longer spring bolts for the dp to mid pipe?

    If not WRX specific, what size do I look for? I want to keep that point flexible.


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