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Thread: CDTI De-cat Question

  1. #1
    Full Member GazVXLINE170's Avatar
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    Vehicle : Insignia

    Trim : SRI VX-Line Nav

    Engine : 2.0 CDTI [170 PS]

    Year : 2015

    Mileage : 27000

    Default CDTI De-cat Question

    Sorry for a repeated post, but what is the deal when it comes to decatting these? Is the Cat not important in a deisel as it is in a petrol? I have read and heard that deisels onlygo through the smoke test and dont get the daft sensor put up their exhausts?

    Iin other words will a deisel pass its MOT without one?

    Cheers,

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    If your diesel had a cat when new, it'll be subject to the ever tighter Euro 4 or 5 limits, which are equalising the emissions for diesels with petrol.

    Older diesels subject to Euro 2 or Euro 3 don't need cats as their MoT test is slightly easier.

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    Regular Member Maverick's Avatar
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    You can remove your cat from ANY nodel year diesel and it won't fail it's MOT because it's not there.

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    Full Member GazVXLINE170's Avatar
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    Default

    Quote Originally Posted by Ruperts Trooper View Post
    If your diesel had a cat when new, it'll be subject to the ever tighter Euro 4 or 5 limits, which are equalising the emissions for diesels with petrol.

    Older diesels subject to Euro 2 or Euro 3 don't need cats as their MoT test is slightly easier.
    Cheers bud, cat will stay then, mines is 2004 and im assuming the 1.9's are Euro 3 at least.

    Gazza4
    Insignia VX-Line Nav CDTI 170.

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    Full Member GazVXLINE170's Avatar
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    Quote Originally Posted by Maverick View Post
    You can remove your cat from ANY nodel year diesel and it won't fail it's MOT because it's not there.
    Cheers Maverick
    Insignia VX-Line Nav CDTI 170.

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    Regular Member Ste's Avatar
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    Default

    They are there to remove HC CO VOC and SOF. The MOT is only a free acceleration to high idle smoke test.

    It will not fail MOT without a cat.

    HOWEVER. Purposely removing a standard fit device that reduces harmful emissions is in my opinion immoral, unethical and should be illegal.

  7. #7
    Regular Member Maverick's Avatar
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    Quote Originally Posted by Ste View Post
    They are there to remove HC CO VOC and SOF. The MOT is only a free acceleration to high idle smoke test.

    It will not fail MOT without a cat.

    HOWEVER. Purposely removing a standard fit device that reduces harmful emissions is in my opinion immoral, unethical and should be illegal.
    And.....................it does make that much difference by taking it out. All it will do is allow the engine to rev a little higher, which you could argue would produce a little more power at the top of the rev range.

    I would not bother taking it out to be honest, on a standard car for everyday driving you would be pushed to notice anything. I am also of the opinion that modern cars are designed to have cats, so leave them alone.

  8. #8
    Regular Member samngeorge1985's Avatar
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    in my opinion you should remove it i think the louder the better LOUD AND PROUD

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    Quote Originally Posted by samngeorge1985 View Post
    in my opinion you should remove it i think the louder the better LOUD AND PROUD
    Then leave to cat on and fit a straight-through pipe instead of the centre silencer.

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