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Thread: Catalytic Converter stolen - replacement advice please

  1. #1
    Pionir's Avatar
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    Question Catalytic Converter stolen - replacement advice please

    Hi, I just had my cat stolen from my Accord Type-R in broad daylight - they jacked up the car and cut it out with an electric hacksaw. Grrr.

    I've never really got my head around exhausts and the differences between decat / cat back and how you can use a decat if a cat is required for the mot. Do people just swap in the cat for the mot? Surely if you have a crash the insurance is invalid?

    I've got what's left of an OEM system with pre-facelift back boxes. I was happy with the noise level (after taking off some very loud and boomy back boxes when I got the car).

    Are there 3rd party alternatives to OEM Honda cats that are worth getting or are they all just rubbish and unlikely to pass mot?

    I'm not interested in extra performance, or swapping stuff around come MOT time, but it's an opportunity to have a nicer (not louder!) exhaust note. I was thinking about the Mongoose which isn't supposed to be too loud. Budget is £500

    Any suggestions welcome.

    Cheers, David

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    Legally you need a cat. A lot of us have or still do remove the cat. Either come mot time you need a very friendly tester or to swap everything over for the test.

    You can pick up a second hand cat cheap on eBay and same for the OEM cat back.

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    B16 Hazz's Avatar
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    Sorry to hear that. The absolute cheek of some people!!! Whereabouts in the UK was this??

    I'm really not familiar with the Accord range at all so I can't offer much solid advice. The only thing I will say is beware of cheap chinesium copy CATS (heh... copycat...). If you can get hold of a 2nd hand Honda one in decent condition, that'll be your best bet. A new one will likely cost several billion.
    UKDM y0!

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    OEM ones new are horrifically expensive, you have my sympathies. I was considering replacing my EP3 one recently and they were £2700 new

    Third party/cheap ones will generally require either some form of mapping or a standoff for the post-cat O2 sensor otherwise your car's check-engine light will be permanently lit.

    I hope you can find one second-hand.
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    Utter b'stards.
    May the fleas of a thousand camels infest their curly hairs, alternatively a slow painful death.
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    Quote Originally Posted by Hazz View Post
    Sorry to hear that. The absolute cheek of some people!!! Whereabouts in the UK was this??

    I'm really not familiar with the Accord range at all so I can't offer much solid advice. The only thing I will say is beware of cheap chinesium copy CATS (heh... copycat...). If you can get hold of a 2nd hand Honda one in decent condition, that'll be your best bet. A new one will likely cost several billion.
    Leafy Teddington, SW London. What's up with the cheap Chinesium Copycats (tm)? Do you lose performance?

    Quote Originally Posted by mike.h View Post
    OEM ones new are horrifically expensive, you have my sympathies. I was considering replacing my EP3 one recently and they were £2700 new
    Ouch, that will almost certainly make my (otherwise very healthy) car a write off


    I've seen that some exhausts have "sports cats" which are less attractive to the tea leafs because they have less of the rare metals but does that mean the car won't pass the MOT emissions? Has anyone has experience of them?
    Something like this: https://www.larkspeed.com/index.pl?p=MONGHDS008&a=i

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    B16 Hazz's Avatar
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    Quote Originally Posted by Pionir View Post
    Leafy Teddington, SW London. What's up with the cheap Chinesium Copycats (tm)? Do you lose performance?



    Ouch, that will almost certainly make my (otherwise very healthy) car a write off


    I've seen that some exhausts have "sports cats" which are less attractive to the tea leafs because they have less of the rare metals but does that mean the car won't pass the MOT emissions? Has anyone has experience of them?
    Something like this: https://www.larkspeed.com/index.pl?p=MONGHDS008&a=i

    Just a bit of a gamble really. You might get lucky and get a decent one. More likely you'll get one that does any of the following:

    Doesn't fit
    Disintegrates on vtec
    Clogs & chokes the car
    Doesn't actually contain anything to reduce emissions
    Doesn't contain sufficient doobilydoo's to pass emissions
    Is made from a hard cheese or bi-products from tofu production.
    UKDM y0!

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    Quote Originally Posted by Hazz View Post
    Just a bit of a gamble really. You might get lucky and get a decent one. More likely you'll get one that does any of the following:

    Doesn't fit
    Disintegrates on vtec
    Clogs & chokes the car
    Doesn't actually contain anything to reduce emissions
    Doesn't contain sufficient doobilydoo's to pass emissions
    Is made from a hard cheese or bi-products from tofu production.
    I bought one a while back and had issues with fit and ECU. Ran okay for ~150Mi, then the CEL came on, and stayed on. Took my old cat to Hayward & Scott and had them replace the flange instead, great work, and a functional cat.

    You'll often see this kind of line on the sales page for a cheap sports cat:

    .. is not type approved and may not pass an MOT. Additional modification to engine management sytem may be required

    IMHO, avoid this kind of thing.
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    Quote Originally Posted by Hazz View Post
    Sorry to hear that. The absolute cheek of some people!!! Whereabouts in the UK was this??
    Itís rife across west London and into the Home Counties, there have been thousands of thefts in a few types of cars across a relatively small area.

    Admittedly this is the first instance of an ATR that Iíve heard of, but a few other models of Hondas are popular targets so maybe they thought this was worth a gamble.


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    Pionir's Avatar
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    It turns out that Mongoose system doesn't include a sports cat - it's just a bit of generic text for other models thats included in the Accord advert

    My current favoured option is Solid Fabrications sports cat and Flexi pipe and Mongoose cat back.

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