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Thread: Chances of passing NCT with decat downpipe

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    Chances of passing NCT with decat downpipe

    Hi guys, my downpipe appears ‘proper****ed’ and I failed the nct on lambda due to air getting into the exhaust. All other readings were super low - I have a decat Hayward & Scott one I was planning on fitting after the test but was thinking of chancing the retest with it - has anyone tried it or what do you think my chances are ?

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    Full ISDC Club Member Sheriff's Avatar
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    Fit it and send it!

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    Full ISDC Club Member Grahamo spec c's Avatar
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    Not a hope if there is no cat in it.
    im not here for a long time,im here for a good time colin mcrae. r.i.p.

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    As graham has said Not a hope with a decat . I have a cat downpipe here you can borrow should be the same but not well up on foresters
    colin, richard, bertie, frank, gone but not forgotten.

    Peter marks account Reopened in Style!!!

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    Fozzy (01-06-2018)

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    Quote Originally Posted by scoobysub View Post
    As graham has said Not a hope with a decat . I have a cat downpipe here you can borrow should be the same but not well up on foresters
    That would be awesome man - might drop out to you over the weekend if that suits, I’ll bring the decat with me to measure up? Maybe shoot me a PM with your number and I’ll drop you a text? Cheers again

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    As said not a hope passing emissions , they struggle even with proper cats fitted.

    My STi does be on the emissions test for a good 10 mins trying to pass it.

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    Full ISDC Club Member dontommy's Avatar
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    I went once with full decat knowing that l will fail as l couldn't organize cat in time. And god bless the fellow in the nct center he rev my car for solid 10mins trying to get a good reading but it wasn't ment to be.

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    scoobysub (01-06-2018)

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    Full ISDC Club Member BazGF8's Avatar
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    Long and short of it is though it’ll never pass with a decat
    V4 Sti Wagon

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    Cheers folks - that’s a resounding ‘NO!’ Thankfully Scoobysub has come to the rescue! It’ll hopefully have a cat on for the NCT, that said I’m really curious so I think I’ll drop up to a friend with an emissions reader once the decat is on just for the curiosity

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