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[dave the builder]

for MOT euro emission standards (as per VTS device/ in service exhaust emission standards for road vehicles 19th edition)
x25xe and x30xe are Max CO Limit %Vol 0.3 Fast Idle, 0.5 Normal Idle, 200 ppm HC
z26se and z32se  are Max CO Limit %Vol 0.3 Fast Idle, 0.5 Normal Idle  200 ppm HC
0.97 to 1.03 lambda obviously
x prefix being euro 2 1996 on
z prefix being euro 3 2000 on

so that was well thought out 

[Raeturbo]

Exactly the same then

[Nick W]

And the H/C requirements are largely unaffected by the cat and O2 sensors unless there is something badly wrong upstream; it's a better view of how good the bores/pistons/rings/valve stems are.

[biggriffin]

Putting 3.0L cats on a 3.2L doesn't affect the emissions for mot.

[dave the builder]

Putting 3.0L cats on a 3.2L doesn't affect the emissions for mot.

for those who wanted a plain English summary of the tech talk   

[Lizzie Zoom]

Fair enough everyone; I am out voted!   

I just wanted to make amba clear of the facts with the cats being advertised when he has the same model as me of the same year

Better to be safe than sorry as my mum always said

[dave the builder]

Fair enough everyone; I am out voted!   

I just wanted to make amba clear of the facts with the cats being advertised when he has the same model as me of the same year

Better to be safe than sorry as my mum always said

not so
you make valid points Lizzie 
also, we all pay £305 to spew Co into the air , because we drive polluting tanks
My emissions at MOT where zero C0 ,HC was very low (can't remember exact number)

yet I follow new cars spewing out visible smoke , they pay £30 RFL 
 

[Lizzie Zoom]

Fair enough everyone; I am out voted!   

I just wanted to make amba clear of the facts with the cats being advertised when he has the same model as me of the same year

Better to be safe than sorry as my mum always said

not so
you make valid points Lizzie 
also, we all pay £305 to spew Co into the air , because we drive polluting tanks
My emissions at MOT where zero C0 ,HC was very low (can't remember exact number)

yet I follow new cars spewing out visible smoke , they pay £30 RFL 

Thanks Dave!

I was beginning to think differently given some of the reactions!

[amba]

I didn't realise I had opened up "Pandoras Box".

Logic on a cost basis is to fit the cats from a 3.0/2.5 with the single catalytic converter,although as only 1 of mine is rattling the decision has been clouded slightly tbh.

Do I buy 2 at a cost of around £150 and then pay the extra for bosses which accept is negligible but as I don't have the skill set or equipment to weld then that is an extra cost.I am therefore in effect needing to replace 2 ...of which 1 original seems to be working correctly to avoid an MOT tester noticing 1 cat has 2 catalytic boxes and the other only 1 which I assume would be a no go 

[Doctor Gollum]

A bit of light reading...

https://www.gov.uk/government/publications/catalytic-convertors/catalytic-converters-advice-on-type-approval-and-legal-requirements-for-suppliers-and-manufacturers

[Lizzie Zoom]

A bit of light reading...

https://www.gov.uk/government/publications/catalytic-convertors/catalytic-converters-advice-on-type-approval-and-legal-requirements-for-suppliers-and-manufacturers

Yep, very interesting and in particular the following paragraphs should be food for thought for those intending to use a non sapproved type on a car that requires the approved cat:

"Breaching the requirements of the 2009 Regulations can amount to a criminal offence, punishable by a fine of up to £5,000.

It is also an offence under the Road Vehicles (Construction and Use) Regulations (Regulation 61a(3)) to use a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet. The potential penalties for failing to comply with Regulation 61a are fines of up to £1,000 for a car or £2,500 for a light goods vehicle."

But I suppose everyone has the right to make their own decision, take the risks and then take the consequences if they arise, like with everything else we do with our cars

[Lizzie Zoom]

I didn't realise I had opened up "Pandoras Box".

Logic on a cost basis is to fit the cats from a 3.0/2.5 with the single catalytic converter,although as only 1 of mine is rattling the decision has been clouded slightly tbh.

Do I buy 2 at a cost of around £150 and then pay the extra for bosses which accept is negligible but as I don't have the skill set or equipment to weld then that is an extra cost.I am therefore in effect needing to replace 2 ...of which 1 original seems to be working correctly to avoid an MOT tester noticing 1 cat has 2 catalytic boxes and the other only 1 which I assume would be a no go

I know what I would do, but it is your decision amba after considering all the above; best of luck with that!

[dave the builder]

I didn't realise I had opened up "Pandoras Box".

Logic on a cost basis is to fit the cats from a 3.0/2.5 with the single catalytic converter,although as only 1 of mine is rattling the decision has been clouded slightly tbh.

Do I buy 2 at a cost of around £150 and then pay the extra for bosses which accept is negligible but as I don't have the skill set or equipment to weld then that is an extra cost.I am therefore in effect needing to replace 2 ...of which 1 original seems to be working correctly to avoid an MOT tester noticing 1 cat has 2 catalytic boxes and the other only 1 which I assume would be a no go

I know what I would do, but it is your decision amba after considering all the above; best of luck with that!

Team up with someone who's cat is rattling on the other side Lizzie to reduce the cost   

[Lizzie Zoom]

I didn't realise I had opened up "Pandoras Box".

Logic on a cost basis is to fit the cats from a 3.0/2.5 with the single catalytic converter,although as only 1 of mine is rattling the decision has been clouded slightly tbh.

Do I buy 2 at a cost of around £150 and then pay the extra for bosses which accept is negligible but as I don't have the skill set or equipment to weld then that is an extra cost.I am therefore in effect needing to replace 2 ...of which 1 original seems to be working correctly to avoid an MOT tester noticing 1 cat has 2 catalytic boxes and the other only 1 which I assume would be a no go

I know what I would do, but it is your decision amba after considering all the above; best of luck with that!

Team up with someone who's cat is rattling on the other side Lizzie to reduce the cost   

 

[Lizzie Zoom]

.....that famous scene in the great film Dirty Harry with Clint Eastwood comes to mind:

"Well, punk, are you feeling lucky?  Well are you?  I know what you are thinking, has my Magnum, the worlds's most powerful hand gun fired six shots, or just 5?"