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Cat changeout. One or both?

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHCat changeout. One or both?

Leading reported evidence

Use converters

Performed · outcome unconfirmed

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
I bought two used converters from a salvage facility.
Original post Read captured discussion
Cat changeout. One or both?

Frequently discussed work

Replace both

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
Unless the suspected bad converter is relatively new I'd replace both.
Original post Read captured discussion
Cat changeout. One or both?

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Leading evidence: 'Use converters' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace both' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace both

Suggestion or failed attempt

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Discussions that contain suggestions: 1

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Suggestion
Unless the suspected bad converter is relatively new I'd replace both.
Original post Read captured discussion
Cat changeout. One or both?

Run very well

Suggestion or failed attempt

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
What is not my imagination is the engine is running very well.
Original post Read captured discussion
Cat changeout. One or both?

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace both

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Unless the suspected bad converter is relatively new I'd replace both.
Original post Read captured discussion
Cat changeout. One or both?

Run very well

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
What is not my imagination is the engine is running very well.
Original post Read captured discussion
Cat changeout. One or both?

Use converters

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
I bought two used converters from a salvage facility.
Original post Read captured discussion
Cat changeout. One or both?

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My driver side Cat is gone, causing CELs and rattling something terrible. I'm planning on replacing it myself with a DEC direct fit. It appears that it might be an easier process if the passenger Cat is out of the way. So, does it make sense to spring the extra $350 or so for the passenger Cat and do both at the same time, or save the $$ for something else, even if it means a bit more work. Opinions and advice are welcome! Thanks! John

POST 2Original post

Murphys law. As soon as you change one the other will go. Easy for me to spend your money though.

POST 3Original post

Quotes source post: 11573965

sounds like you already know the answer

POST 4Original post

Quotes source post: 11574749

+1 Happened to me with another car.

POST 5Original post

Quotes source post: 11573965

Unless the suspected bad converter is relatively new I'd replace both. FWIW, I recently broke down and dealt with a rattly converter on my Boxster. I bought two used converters from a salvage facility. Before purchasing I gave both the shake test and both were quiet. I had the Porsche dealer tech install the used converters and the "new" converters are quiet -- it was an eye opener to realize how much noise the noisy converter was making as soon as I had a quiet converter on the car -- and the P0430 error code has not reappeared. The engine feels stronger but this may be my imagination. What is not my imagination is the engine is running very well.

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