Cell count of the main cat?

[Harlan_Kovacs]

Heya,

I'd be really interested in knowing the cell count of the main cat. I plan on swapping it for a sport cat (200 cell). Obviously I don't want to rip it all out to find it is already a 200 cell!

Anyone cut one open?

Many thanks!

Mark

[blitzracing]

Surely the cat diameter will tell you what you want? You cant increase the flow with more cells without making it bigger id of thought.

[rigga]

Having fitted a 200 cell sportscat to my mini, to replace the original, comparing the size difference which is massive, there's no way in the world, that dustbin size cat on the Tvr, is 200 cell .

[Harlan_Kovacs]

Hey Blitz,

I'm not sure. I *think* that in the sports cats, the density of the cat is less (more empty space per square cm), so in theory, a 100 cell cat could occupy the same space as a 400 cell cat.

- Mark

[TwinKam]

This.
You want a lower cell count than 'standard' to increase flow, but the balance is in achieving more flow whilst still having sufficient surface area to treat your exhaust to MoT standards, ie at both natural idle and, crucially, fast idle, which is where the reduced surface area will be noticed more.

[Monsterlime]

I'm interested in this as well. I am sure I have seen a post on here or FB of someone doing similar, removing the existing cat and putting a sports one in, further down the line so reducing under bonnet temp (and getting to fit the art work that is the Clive F pipe) and still passing an MOT on emissions.

[sapper]

I fitted a 200 cell a couple of years ago. My car was turbo charged so no room for the main cat. It struggled with the MOT but wasn’t far off. But the car was mapped for turbo. So I don’t think it would be far off if you have a system which is mapped expecting a cat. Happy for an expert to jump in.

http://www.ebay.co.uk/itm/200-CELL-HIGH-FLOW-SPORT...