High-flow cats
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From: Norman, OK
High-flow cats
I posted this query in another post, but the conversation seemed to end up quite a bit removed, so I am going to re-post to see if I get some more responses. I have true dual exhaust/headers/performance mufflers, with the pipes running parallel until well after the mufflers. I want to put my cats back on. I have two options: install one high-flow cat on each pipe OR use one high-flow cat which has two inlet ports and two outlet ports for the dual exhaust arrangement. Dynomax makes such a cat. Does anyone have an opinion as to one arrangement over the other? What about Dynomax cats? Any opinions on that brand? I have never used Dynomax anything, but I see them quite a bit in various performance parts magazines. Also, just to keep this post on topic, please don't comment on the wisdom of reinstalling the cats. I have my reasons and am simply looking for comments on the high-flow cat/Dynomax issue. Thanks.
Mike
Mike
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Dynomax is a good brand. I have been pleased with the Dynomax cat-back exhaust I have on my truck. I will probably end up getting Dynomax cats when I run a new exhaust system with a new engine.
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yeah, that thread was hijacked 
here it is again.
mike2112, I'm not familiar with dynomax's parrallel inlet outlet cat. I meant factory configuration when I said 2 into 1. The two factors that will effect efficiency with a cat are inlet and outlet diameter: does either restrict the exhaust flow. The other factor is the diameter of the honey comb. Usually it's square in shape, so figure width and height. If the dyno max cat gives you equal honey comb diameter to 2 high flow cats, then I would say that the performance will be equal. If the dynomax cat has the same honeycomb dimension as one high flow cat ( and the only difference is the inlet and outlet configuration) it will be more restrictive, especially with higher cfm.
here it is again.mike2112, I'm not familiar with dynomax's parrallel inlet outlet cat. I meant factory configuration when I said 2 into 1. The two factors that will effect efficiency with a cat are inlet and outlet diameter: does either restrict the exhaust flow. The other factor is the diameter of the honey comb. Usually it's square in shape, so figure width and height. If the dyno max cat gives you equal honey comb diameter to 2 high flow cats, then I would say that the performance will be equal. If the dynomax cat has the same honeycomb dimension as one high flow cat ( and the only difference is the inlet and outlet configuration) it will be more restrictive, especially with higher cfm.
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From: Norman, OK
Originally Posted by 93f250-44cepeks-olf-olf
yeah, that thread was hijacked here it is again.
mike2112, I'm not familiar with dynomax's parrallel inlet outlet cat. I meant factory configuration when I said 2 into 1. The two factors that will effect efficiency with a cat are inlet and outlet diameter: does either restrict the exhaust flow. The other factor is the diameter of the honey comb. Usually it's square in shape, so figure width and height. If the dyno max cat gives you equal honey comb diameter to 2 high flow cats, then I would say that the performance will be equal. If the dynomax cat has the same honeycomb dimension as one high flow cat ( and the only difference is the inlet and outlet configuration) it will be more restrictive, especially with higher cfm.
here it is again.mike2112, I'm not familiar with dynomax's parrallel inlet outlet cat. I meant factory configuration when I said 2 into 1. The two factors that will effect efficiency with a cat are inlet and outlet diameter: does either restrict the exhaust flow. The other factor is the diameter of the honey comb. Usually it's square in shape, so figure width and height. If the dyno max cat gives you equal honey comb diameter to 2 high flow cats, then I would say that the performance will be equal. If the dynomax cat has the same honeycomb dimension as one high flow cat ( and the only difference is the inlet and outlet configuration) it will be more restrictive, especially with higher cfm.
"Thank you for your inquiry for Dynomax Exhaust. We appreciate your interest in our products. In regards to our converters, they will have an internal monolithic brick with 400 squares per cubic inch, however by using two large body converters over a single dual inlet converter, you will have a total larger frontal area, thus having more flow."
Next question will be how significant is the flow difference. The quest continues . . .
Last edited by mike2112; Feb 6, 2006 at 10:45 PM. Reason: needed to clarify the quote
