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  1. #1
    Join Date
    Jul 2013
    Location
    HK
    Age
    47
    Posts
    15

    Adding Catalytic converter to sidepipes

    Hi all,
    haven't been on the forum in a while.
    I finally got my Cobra to HK about 2 months ago, but my agent here has been dragging on slow.
    Anyways the current shop they have looking at getting the Cobra to pass the First Registration inspection say I will need cats.
    I'm registering the car as a "classic car" (as it's made in 1998 and 20 years old now) I get some limited exception on emissions, but need it to be similar to something from 1998.
    The engine is a carbureted Chevy 5.7L
    Has anyone here added cats to their sides pipes and was able to pass MOT?

    I was thinking about doing it like this pic, but it might be too far back from the engine


    Or will I need to add them before the 4 into 1 header?


    thanks
    Attached Images Attached Images

  2. #2
    Join Date
    May 2004
    Location
    STOKE ON TRENT, U.K.
    Age
    53
    Posts
    10,117
    What you have there will work. It's what I do.
    ‚ÄčPro Cobra Builder
    DB427SC

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    Low Volume manufacturer of
    ALUMINIUM BODY, ROUND TUBE CHASSIS.
    ORIGINAL SPEC. SUSPENSION COBRAS.
    OEM style stainless SIDEPIPES


  3. #3
    Join Date
    Apr 2005
    Location
    Worcestershire
    Age
    43
    Posts
    1,961
    Quote Originally Posted by kmn5 View Post
    Or will I need to add them before the 4 into 1 header?
    That's what AK do for LS3.
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  4. #4
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    8,041
    idle question - does the cat make the sidepipes quieter as well as 'cleaner'?
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  5. #5
    Join Date
    Aug 2016
    Location
    WELLINGBOROUGH
    Posts
    75
    Oh - I hope so!!!

    sceptic

  6. #6
    Join Date
    Jan 2017
    Location
    Mansfield, Notts
    Posts
    49
    Quote Originally Posted by KevinW View Post
    idle question - does the cat make the sidepipes quieter as well as 'cleaner'?
    Yes I would think so. I've got under slung exhausts on my Cobra. Twin cats under the foot wells and twin cherry bomb type straight throughs out of the back.
    Early in the year while working on the exhaust I removed both rear silencers. Out of curiosity I ran the engine and there wasn't much of a noticeable increase in
    noise with only the cats.

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