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Planet-9

987.1 Exhaust/Header Forensics

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YOUR RESEARCH987.1 Exhaust/Header Forensics

Leading reported evidence

Adjust exhaust maps

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Suggestion

If you do install the headers, let Scott know so he can adjust his exhaust maps to give you the best rear wheel torque outcome.

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987.1 Exhaust/Header Forensics
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Leading evidence: 'Adjust exhaust maps' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust exhaust maps' (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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1 matching discussions · 5 captured posts examined · 1 partial discussions

Frequently discussed actions (1)

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Adjust exhaust maps

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

If you do install the headers, let Scott know so he can adjust his exhaust maps to give you the best rear wheel torque outcome.

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987.1 Exhaust/Header Forensics
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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.

  • Planet-9: 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: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

While I wait for my Softronic flashing device, I decided to investigate why the exhaust on my 987.1 2.7L Cayman sounded like it did: moderately loud, stock-looking, with burbles on deceleration and a drone between 2700-3000 RPM. I could not find anything interesting when peeking at the exhaust and headers, but noticed that the driver side catalytic converter has what seems like a weld (left image). I don't see this weld on the passenger side catalytic converter (right image). There is no CEL (which I assumed modifying the cats would trigger) but I don't have a code reader handy to dig further. Am I correct in hypothesizing that one of the previous owners cut open the driver's side cat, modified the insides, and welded it back to make the car sound slightly louder? Or should I look for the source of my loud exhaust somewhere else?

POST 2Original post

I had to copy your pic and blow it up on my computer screen - but it looks like a weld - a factory weld - is failing. Unfortunately - I believe you're out of any emissions warranty coverage for the cat-converter, and a new or even used one is going to be expensive. It's possible a good welder might be able to fix that.

POST 3Original post

Argh, I thought this was done intentionally! It's been like this for at least 6 years, previous owners assumed one of the owners before them had put in an aftermarket exhaust. In either case, I'm going to find some way to replace this. Thankfully I just passed NY inspection.

POST 4Original post

Maybe a time for new Soul catted headers. You will pick up maybe 10 hp to go with your Softronic ECU up grade. If you do install the headers, let Scott know so he can adjust his exhaust maps to give you the best rear wheel torque outcome.

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