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04-05,06 cat back swap

This is a discussion on 04-05,06 cat back swap within the General Help forums, part of the LSx Technical Help Section category; Is the 05,06 GTO cat back a exact bolt up to the 04 GTO with the rear valance changed? Considering ...

  1. #1
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    2004 GTO

    04-05,06 cat back swap

    Is the 05,06 GTO cat back a exact bolt up to the 04 GTO with the rear valance changed? Considering the JBA from www.rpmoutlet.com

  2. #2
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    Let me dig around. I'm not sure if it's a true bolt up or not. I know you'd be a few hangers short due to having a passenger side exit pipe. I also know that there's a size difference. The 04 was 2.25 and the 05 is 2.5 but I'm not sure if that size is different all the way to the manifold or just from the cats back.

  3. #3
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    Ok, did some digging. The JBA will bolt right up to your existing exhaust. The JBA kit also comes with the extra hanger you'll need.If you go with a true 05 exhaust then you'll also need mid pipes.

  4. #4
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    2004 GTO

    Thanks for the feed back.

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