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.

temo_wil
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Re: Cat replacement

Post by temo_wil » Wed Apr 21, 2021 10:07 am

Any news on these?

F4rdy
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Re: Cat replacement

Post by F4rdy » Wed Apr 21, 2021 7:00 pm

Really interesting in these zinram pipes

I’ve had their Audi TT mk1 downpipes kit before and it was epic quality but didn’t fit the RHD chassis

My only concern is how low to the ground these will be as standard cats are quite slim shaped

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Sat May 15, 2021 6:36 am

Hi, being fitted as we speak, will let you know how they are, delivery took a while and had to email a few times but they look ok.

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Mon May 17, 2021 4:26 pm

Hi just car back, drove 100km home, no engine management light coming on. The old cat on left side was totally shot and so were the o2 sensors. Had all the 4 sensors replaced, garage said the replacement cats dropped straight in, so at this time very happy.

F4rdy
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Re: Cat replacement

Post by F4rdy » Mon May 17, 2021 8:16 pm

Bobby, what size pipework did you order? I've got a milltek cat back and looking for a straight fit job

Bobbyg
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Re: Cat replacement

Post by Bobbyg » Tue May 18, 2021 6:34 pm

I am running a milteck cat back non res, the dia is 60mm, you have to specifie on ordering the size you want. They have removed the pre cat. I ordered the 200 cell cats as they conform to Europe standards.

TrevoRS4
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Re: Cat replacement

Post by TrevoRS4 » Tue Aug 17, 2021 12:25 am

Bobbyg wrote:
Tue May 18, 2021 6:34 pm
I am running a milteck cat back non res, the dia is 60mm, you have to specifie on ordering the size you want. They have removed the pre cat. I ordered the 200 cell cats as they conform to Europe standards.
So you bought the more expensive of their 200 cell options?
I finally had mine put on a few weeks ago with the standard 200 cell cats. I’ll say the sound has really been uncorked with the scorpion axle back. Just the right amount of burbles and pops. I also have no CEL for cat performance.
The one downside I have noticed is increased exhaust smell when stopped with the windows down.
For reference I have these: https://www.fahrzeugtechnik-zinram.de/e ... oducts/218

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