Cat replacement

4.2 V8 32v Naturally Aspirated - 414 bhp
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Bobbyg
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Cat replacement

Post by Bobbyg » Wed Feb 10, 2021 4:41 pm

Hi guys, in need to replace the cats on my 2006 b7, which is best 100 or 200 cells and what is the difference? Many thanks

w00kie
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Re: Cat replacement

Post by w00kie » Thu Feb 11, 2021 3:34 pm

Lifted from another forum:

"Nomenclature on catalytic converters is as follows. CPSI is the acronymn for cells per square inch. CPSI is the description used worldwide despite the metric system.

So therefore 400CPSI, 300CPSI, 200CPSI, 100CPSI and 0.00 CPSI equate to sqeezing 400 small squares into a 1.0" sqaure all the way down to only 100 square cells per 1.00" square"

From memory both will pass MOT emissions testing and in the real world you probably wouldn't notice much difference between them. I probably go for the 100 cell as on paper they're the least restrictive but I would equally mostly be swayed by cost

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Thu Feb 11, 2021 6:13 pm

Many thanks for that, don’t so-pose you know of a company that supplies or makes them that would export to France, just had a quote from Audi France a cool 2450€!!! Thanks again for the info.

TrevoRS4
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Re: Cat replacement

Post by TrevoRS4 » Fri Feb 12, 2021 2:44 am

I have a set of these with 200 cell cats waiting to go on:
https://www.fahrzeugtechnik-zinram.de/e ... _B7_42l_V8
They utilize a metal (not ceramic) catalyst which is good. Quality of fabrication looks solid.

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Fri Feb 12, 2021 5:42 pm

TrevoRS4, I was looking at these cats, is your car a saloon or avant? Did you have to get reductions or is it a straight fit? I have a miltek non res exhaust fitted and think the pipes are 63mm.

TrevoRS4
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Re: Cat replacement

Post by TrevoRS4 » Sat Feb 13, 2021 2:13 am

Mine is a saloon... the Zinram site says they’re 63.5mm so they should mate right up

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Sat Feb 13, 2021 9:46 am

Do you know if there is a difference between a saloons exhaust and an avants?

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Fri Mar 05, 2021 8:18 pm

Trevors4 thanks for the link now ordered, will post when fitted and report if any good.

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