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Registered:
November 2002
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Re: Performance of a high flow catalytic converter
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Mon, 18 April 2005 13:54
 
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I will have a go at this question.....
There should be no emissions difference between a high-flow cat and a standard cat, each will convert the gases to the safer varieties, the high flow cat will (usually) do it while flowing more air at the same time.
Besides price, I would say no on the converting factor, but yes on the flow rate, usually.
Cats need heat to work, so the closer they are located to the exhaust manifold the better they will operate. I would hazard a guess that if the standard car used two cats, you will need two as well to pass any emissions test, but it all depends on who is doing the testing. The local test my be nowhere near as strigent as the factory spec's, especially if the car was made for markets all around the world, and Japan and California are very tough on emissions.
If I were you I would get my exhaust made in sections with flanges between them, so if you need to fit another cat you just bolt that in to a section, and then remove it and replace it with just a pipe for freer flowing exhaust gases when you are not being tested.
This way you have the best of both worlds, at little if any extra cost.
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