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Has anyone replaced their cat on a late model C3? I'm thinking of getting the Magnaflow high flow cat and was wondering how much HP I can gain. Also, do the original cats have gaskets that I would need to replace?
 

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I have two brand new Dynamax universal high flow cats, unopened in the Summit racing box, if you might be interested.
 

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No thanks. I don't want to have to weld the cat on. I'm getting the direct-fit model from Magnaflow.

Cool. Magnaflows are really good, and I am sure that you will love them.

One clarification, mine are flanged so they become removable for non emissions activities.
 
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