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Thread: De-DPF pipes on an Estate (or Signum)

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    Default De-DPF pipes on an Estate (or Signum)

    Just a quickie, do these need to be custom made (and by who) or will a regular Vectra non DPF pipe fit - specifically because the Estate/Signum has a longer wheelbase.

    Just the DPF, not the catalyst - I want something to show the M.O.T. man

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    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

    Default

    If your removing the DPF you will need to get that mapped out of the ECU at the same time.

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    Regular Member rockafella8587's Avatar
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    Im not sure about using a pipe from a non-dpf vectra. I just have a fabricated pipe in place of it when mine got removed. I think the cat/dpf is the same unit, i have nothing now, just a back box but i think there is a pre-cat at the very front of the system by the manifold. I dont think you need the cat on a diesel to pass the mot. Dont quote me on that tho as ive not put my car for an mot with it removed yet lol

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    Just to clarify, I know the pre cat is left (hopefully bulgy enough to satisfy a tester!) in place, and I will be needing a remap.

    In all honesty I just want rid of that sub-2000 RPM dead spot, where you can't pull out of junctions.

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    Hi iv had my dpf removed well the insides of it and remaped, also had it checked where I go for mot,s and it passed on there machine also egr shut off, mines still sluggish when pulling away but it is a auto

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    Regular Member blue estate's Avatar
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    I was always led to understand that for MOT.. so long as it passed the cO test.. cat or no cat.. is the important thing?

    Correct me if im being a pleb

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    That's the problem nobody is quite sure! I think the DPF Vectra's are classed as euro IV compliant - I think VOSA wants the testers to confirm the euro IV gubins is still there!

    Thanks for the response so far chaps, but keep 'em coming

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    Regular Member 19CDTi's Avatar
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    Quote Originally Posted by andrew e View Post
    In all honesty I just want rid of that sub-2000 RPM dead spot, where you can't pull out of junctions.
    Glad I'm not the only one grumbling about this!!! I'm thinking my fuel filter is needing done too, which aint gona be helping. I'm intrigued by this decat / DPF situation though

    Stuart

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    Regular Member johp778's Avatar
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    Hi All
    I don't think dpf matters for mot, as long as it passes emissions, which i believe is only CO2, then should b fine. Not all manufacturers fitted dpf's so early, so u can't really bring a rule in, until it can be applied 2 all, ie tax bands apply to vehicles from a particular year, and diesels are lower tax, as CO2 emissions are lower and nox aren't currently tested on mot, unless somethings been changed, that I haven't heard?

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