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danielbrookes

Do I Need A Cat For Iva?

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Hi guys, Ive purchased an exhaust from GBS and I stupidly didnt check to see if it has a CAT. Now I realise it doesnt...

 

So, 2004 crate Zetec engine and car will be registered on new plate - do I require a CAT to pass the IVA?

 

I strongly suspect I do but would like to confirm.

 

Thanks,

 

Dan

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Are you sure it doesn't have one? I didn't think GBS sold them without a cat these days. The cat is built into the main body, its not separate so you can't see it obviously.

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Definately doesnt have one, description on site says so and it has no cat written on it, Ill get boxing and return it. Thanks

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There might be some value in thinking about whether you want a combined silencer and cat anyway, or whether it would be more practical to have a separate cat closer to the engine anyway, and one that is hence replaceable without the other (and vice versa). You can pick up 200 cell cats for £100. And, not that I'm advising this or suggesting it makes any difference, but a separate cat can sometimes "fall off".... <cough>

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Interesting thought brumster, hadnt even considered that. I was thinking Ill probably end up buying the same part again post IVA to decat. Ill do some digging

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Brumster your definately onto something, thanks for the suggestion. Ill need to do some careful measurements for the bracket at the rear (should th CAT fall off...) but a quick look it seems doable and simple.

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Yeah I'd defo keep your current exhaust you've bought mate. Then just remove the cat after

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I have a weld on CAT £40 plus postage if your interested

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Hopefully final question on this one...the diameter of the manifold and the CAT's I have been looking at are both 2", I was thinking of using a sleeve to connect the two with a decent exhaust clamp each end, then finally another clamp connecting CAT to silencer. The clamps I have been looking at are the strap type so look pretty inconspicuous (

 

Manifold > (Clamp) > Sleeve > (Clamp) > CAT > (Clamp) > Silencer

 

I think it will look OK and allows me to remove the CAT in the future if needed. Assuming I have the space, are there any reasons why this wont be acceptable for IVA or generally is a bad idea?

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You may need additional supports since it wont be so rigid, but that should

be easily done.

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It's what I did. I used quality Mikalor clamps, I would suggest the same, their profile is relatively low. For IVA you will need to position the clamp bolt to the back, between the pipe and the bodywork, so that it can't be impacted by the test sphere (or you can wrap it with exhaust wrap to protect the sharp edges if you wish - but for me this wasn't necessary).

 

edit: https://www.304stainlessexhaustparts.com- they are very helpful, sensible prices, good quality steel and they are happy to make up a sleeve to any drawing you provide... can swage in the ends/slits too.

Edited by brumster
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If it was registered with a CAT it will need one for subsequent MOT's under the new rules, so make sure you pick it up if it "falls off"!

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