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Are catalytic converters interchangeable?

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YOUR RESEARCHAre catalytic converters interchangeable?

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Use ones

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Performed · outcome unconfirmed · Original poster

I found a few used ones but I'm not sure which side they are for.

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Are catalytic converters interchangeable?
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Leading evidence: 'Use ones' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use ones' (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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Use ones

No successful repair reported for this finding.

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Discussions that performed work without a confirmed outcome
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Performed · outcome unconfirmed · Original poster

I found a few used ones but I'm not sure which side they are for.

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Are catalytic converters interchangeable?
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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.

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POST 1 / ORIGINAL POSTEROriginal post

I need a new cat. I have a 2003 996 and the cat on the passenger side is shot. I found a few used ones but I'm not sure which side they are for. Are they interchangeable? Meaning are there separate sides or is here one side that you can put on either side. If they are different how do you know which is which? Will a cat from a 2001 fit a 2003? Any advice will be appreciated. Thanks

POST 2Original post

Unique per side. Go by part number to determine which side they belong to. Yes 2001 to 2003 is ok and 2003 to 2001 is ok.

POST 4Original post

Visually, holding the passenger side cat in your hands, with the inlet (flange with studs on the short tube) facing away from you on the right and the outlet (plain long tube) aiming to the left, the O2 sensor holes will be UP!

POST 5 / ORIGINAL POSTEROriginal post

That's a huge help and the advice I was looking for, thank you

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