Hello,

Does anyone know if you can get through IVA on a 100 cpi Cat? Mildy tuned 2 litre Zetec. Presumably I could change the map of the ECU to make the emissions test a bit easier?

Thanks,
James

100cpi might be a bit marginal. Very difficult to know for sure though but I suspect it'd make life a pain at IVA.

whats the norm for the size of a cat used on cars here? plenty of 200cpi cats for cheap in america (£50 or so) but not sure if they'll be great or not since we pay about £200 for something similar here

Blake you can get cheap ones over here.

I've got one of these 400 cell cats, no idea how well they work as ive not had the car on the emissions tester yet.

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interesting! think my pipe is 2.5", but i guess that could be modded...

Hi

We where making 100 cpi units to fit on the race cars that would pass a scrutineer. But when tested to MOT spec by friends MOT station it didn't stand a chance.

Cheers Matt

would a 200 cpi cat be ok for a normal road legal car? My exhaust is degrading and looking to make a ss one with a sports cat

[Edited on 20/2/12 by l0rd]

As a general rule tin-tops have 400cpi cats. 200cpi "performance" cats are efficient enough to pass the MOT and IVA standard test. Once you get to 100cpi matrix there's a lot less cat surface area doing the work so they get a bit marginal.

Thanks chaps, looks like its a 200cpi for me then.

James