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Thread: Decat

  1. #1
    Standard Member Northernsoul65's Avatar
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    Decat

    regular mechanic that deals with track and race bikes says that he has removed the cat on some bikes, kept header pipes and end can, fitted link pipes. How's that sound?
    Or....is a full after marker system preferable?
    Will the ecu sort out the mapping automatically or will it require a remap?
    Either way I'm thinking about the fitting of track fairings in due course.
    thanks guys

  2. #2
    1 YEAR PREMIER MEMBER Tattoobob's Avatar
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    Re: Decat

    Which Gen have you got?

    I have a 17 Gen 3 and I just cut the cat out and fitted a link pipe and end can.

    Rob

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  3. #3
    Standard Member Northernsoul65's Avatar
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    Re: Decat

    2018 Gen 3
    spoke with Phil Crowe earlier re fairings but also asked about this option with exhaust. He said it's defi8nitely done but does need mapping afterwards.


    Quote Originally Posted by Tattoobob View Post
    Which Gen have you got?

    I have a 17 Gen 3 and I just cut the cat out and fitted a link pipe and end can.

    Rob

    Sent from my SM-N960F using Tapatalk

  4. #4
    1 YEAR PREMIER MEMBER Tattoobob's Avatar
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    Re: Decat

    I got mine power commanded and set up on the dyno.

    Rob.

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  5. #5
    Standard Member Northernsoul65's Avatar
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    Re: Decat

    nice one, cheers Rob

    Quote Originally Posted by Tattoobob View Post
    I got mine power commanded and set up on the dyno.

    Rob.

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  6. #6
    1 YEAR PREMIER MEMBER bananaman's Avatar
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    Re: Decat

    If your 17 is the same as my 15 then I just cut the cats out and welded straight through pipes in place. At the time, the consensus was the OE down pipes were very good. It also keeps the rear valve in for noise testing
    Last edited by bananaman; 16th May 2021 at 05:21 PM.
    Speed doesnt kill, its how fast you stop.......

  7. #7
    Standard Member Northernsoul65's Avatar
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    Re: Decat

    yes, that looks like it's the way to go

    Quote Originally Posted by bananaman View Post
    If your 17 is the same as my 15 then I just cut the cats out and welded straight through pipes in place. At the time, the consensus was the OE down pipes were very good. It also keeps the rear valve in for noise testing

  8. #8
    LIFETIME FORUM MEMBER stuartb's Avatar
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    Re: Decat

    I think I'm going to decat my HP4, any suggestions on link pipes, just had a quick scan there, they range from washers to quite a few hundreds of pounds... I've no problem with chinky stuff.. is this what I'm after..
    https://a.aliexpress.com/_mLvdHTr

    This motorrad one looks different...

    https://www.ebay.co.uk/itm/393222162465
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    Last edited by stuartb; 17th May 2021 at 10:41 PM.

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    Forum Moderator alex's Avatar
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    Re: Decat

    To my eye that Y piece on the Aliexpress item is a POS. Exhaust flow should be smooth and allow for expansion. But I'm sure it will do a job.
    Also, both pieces have very different entry directions so which is it you need? Angled or straight?
    \
    Last edited by alex; 18th May 2021 at 09:28 AM.

  10. #10
    LIFETIME FORUM MEMBER stuartb's Avatar
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    Re: Decat

    Quote Originally Posted by alex View Post
    To my eye that Y piece on the Aliexpress item is a POS. Exhaust flow should be smooth and allow for expansion. But I'm sure it will do a job.
    Also, both pieces have very different entry directions so which is it you need? Angled or straight?
    \
    I'm not sure, I just thought a link pipe was a link pipe, as in you cut and fit at the same points no matter what..wouldn't have thought there's much in the way of pipework to play with..

    Can someone can post up some pics of the pipework with the cat removed ?

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    Last edited by stuartb; 18th May 2021 at 11:25 PM.

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