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Re: Replacing Rusted Exhaust Flange And Pipe?
Stock pipe is mild steel with a coating. Sound change should be minimal at most if all you are replacing is the flanges or the flanges and cat.
While you could likely do just the flanges, I'd do the cat at the same time as old cats can be bad news for your performance, and you won't risk having to redo that work in a few months of the cat canister or piping out of it is weak.
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