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Replace one cat or both?

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I got confirmation that I have a cat that is just all sorts of a mixing bowl which explains why I have these long delayed shifts when flooring it. Sometimes the engine will hang and not even shift until well it feels like it. But the shop indicated to me that my first cat coming off the engine is definitely shot. They told me that the second one usually soon after takes a shit too.


Just need opinions if it's worth replacing the other cat to to prevent any more issues with the exhaust. Also this will sky rocket my MPG back up...been getting around 10MPG for the last month or so.


2008 Legacy 2.5i



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