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Thread: Installing the stock cat

  1. #1
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    Installing the stock cat

    anyone know what theses fixings are on the stock cat?:
    https://1drv.ms/u/s!Arf-yOsTGQrvoTC1...1aOEi?e=BvvHZf

    I want to remove the decat pipe and replace it with the stock cat, can i just one to one swap out the decat with the cat? i.e. should be there be any additional fixings holding the stock cat up?

    I cant see anything additional in the service manual other than some bracket connected to the downpipe which i think is what I see here:
    https://1drv.ms/u/s!Arf-yOsTGQrvoSoj...g1KL_?e=p86APs

    cheers

  2. #2
    Banned sideways14a's Avatar
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    The rear of your exhaust doesnt seem to have the bolt up mounting for the rear of the cat unless you have taken a picture of the rear end.
    Most decats have a section that drops out to fit the kitty back in for those with no friends in the MOT industry ;-)

  3. #3
    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    The first picture shows the mountings for the heat shield.

    It should just bolt back in fine.

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    I realize now there is more to this than I thought, apparently cats have an orientation to them and you cant install them the wrong way

    From research most have arrows on them to show the flow of exhaust but this one doesn't, I'm even doubting if this is the stock cat now, the only markings on it says X5, its doesn't look like any of the stock cats I see in pictures

    There are honeycombs in both sides and one is more sooty than the other so assuming that is the front?

    The service manual picture is really poor so its hard to tell but there are no images of those clips on mine or any indication of a fixing to the heat shield

    Sorry I know this sounds silly but I didn't take the stock cat out myself so still not sure which way round/way up it goes
    Last edited by sr20det1; 08-05-2021 at 17:21.

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    I realize now there is more to this than I thought, apparently cats have an orientation to them and you cant install them the wrong way

    From research most have arrows on them to show the flow of exhaust but this one doesn't, I'm even doubting if this is the stock cat now, the only markings on it says X5, its doesn't look like any of the stock cats I see in pictures

    There are honeycombs in both sides and one is more sooty than the other so assuming that is the front?

    The service manual picture is really poor so its hard to tell but there are no images of those clips on mine or any indication of a fixing to the heat shield

    Sorry I know this sounds silly but I didn't take the stock cat out myself so still not sure which way round/way up it goes

    https://1drv.ms/u/s!Arf-yOsTGQrvoyeN...TJp0c?e=Z3kJmP
    Last edited by sr20det1; 08-05-2021 at 17:28.

  6. #6
    Banned sideways14a's Avatar
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    Er... orientation?? well there could be but ... emm..... it never mattered what my car spat out its exhaust for an MOT as the test sensor was always up the rear of a nearby 1ltr micra.

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    There does seem to be a common orientation and I think I figured it out by looking at a few pics on the web, this is the best example i found: https://www.driftworks.com/forum/thr...inside.241747/

    So heat shield underneath (i don't have one which is part of the confusion) and shorter side facing towards the engine

    From what i read though only 3 way cats have a direction of flow arrow, if this is a 2 way cat it doesn't really matter I guess

    First MOT with this car so wanted to get it right

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    Just realized, previous owner fitted an HID kit for the front headlights, that's a definite MOT fail these days, any idea what is the quickest path I can take to getting this MOT legal again

    Presumably its not as simple as just putting stock bulbs back in again?

    Cheers
    Last edited by sr20det1; 11-05-2021 at 14:52.

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    Banned sideways14a's Avatar
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    My ... cough... HID lights always passed an MOT - so did my catless system because of, i think it was magic.

    Could have been money, or me changing them out for the MOT (if plod is listening, its because my car was 200% road legal so sod off)

    Its always good to have friends in the mechanics trade.

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    Banned sideways14a's Avatar
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    ohh and to help out, i would fit stock bulbs, you would have to rewire the stock feeds from the relay for the HIDs to the lamps - not an epic pain in the arse but still..

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    yeah think that's what am going to do, just need it back on the road asap - cheers bud!

  12. #12
    Yorkshire Rep CMR's Avatar
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    The cat will only fit one way when you actually come to bolt it in.

    Also, the HID will pass without any issue at all, the s14a (which I'm assuming you have) came with projector lenses anyway and unless you found the most anal MOT tester in the UK the beam output from the aftermarket HID;s will be fine and it will pass the test.

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    Thanks CMR, yup Cat went in fine

    HID being removed now as test station said it was an instant fail, they tried but couldn't get the beam within spec

    Rules on HID/LED seem to have got a lot stricter as per 2021 this year

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    Quote Originally Posted by CMR View Post
    The cat will only fit one way when you actually come to bolt it in.

    Also, the HID will pass without any issue at all, the s14a (which I'm assuming you have) came with projector lenses anyway and unless you found the most anal MOT tester in the UK the beam output from the aftermarket HID;s will be fine and it will pass the test.
    No prob with HID inspection here either. We're gonna do the cat on buddy's project after the installation of the suspension from 4Wheelonline.

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