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Thread: Z32se Pre cat

  1. #1
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    Default Z32se Pre cat

    Has anyone here removed the pre cats, any problems after etc.
    Has anyone removed their pre cat on any vectra c engine with any probs.
    Realy want to get rid of them tbh, only concern is if i'm goung to be left in limp mode.

  2. #2
    Full Member Big Sig's Avatar
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    Is a very naughty boy
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    I have seen people remove the centre cat but not the pre cats. You will need to leave a cat in somewhere or it will fail the MOT on emmissions.
    Now I need a turbo to keep up!

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    I'll leave the main cat in, but want to remove the others

  4. #4
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    What Big Sig said - leave the precats but by all means remove the centre cat on the exhaust.

    Don't mess with the pre-cats or you'll have all sorts of problems. When another member used to be on here, GSi3.2, he knew all there was to know about the 3.2 V6, and he said don't touch the precats.

    Removing the main centre cat (I've done mine) gives IMO, more flexibilty and makes the car more "driveable" low down if this makes sense.

  5. #5
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    The o2 sensors are before and after the pre cats so that whole set up needs to stay stock, but as said, feel free to remove the main cat. GSi3.2 (Mark) got his info from the actual engine designer of the Z32SE when he went over to the Irmscher factory.

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