Cat replacement
Cat replacement
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
Re: Cat replacement
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
"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
Re: Cat replacement
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.
Re: Cat replacement
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.
https://www.fahrzeugtechnik-zinram.de/e ... _B7_42l_V8
They utilize a metal (not ceramic) catalyst which is good. Quality of fabrication looks solid.
Re: Cat replacement
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.
Re: Cat replacement
Mine is a saloon... the Zinram site says they’re 63.5mm so they should mate right up
Re: Cat replacement
Do you know if there is a difference between a saloons exhaust and an avants?
Re: Cat replacement
Trevors4 thanks for the link now ordered, will post when fitted and report if any good.
Re: Cat replacement
Any news on these?
Re: Cat replacement
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
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
Re: Cat replacement
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.
Re: Cat replacement
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.
Re: Cat replacement
Bobby, what size pipework did you order? I've got a milltek cat back and looking for a straight fit job
Re: Cat replacement
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.
Re: Cat replacement
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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