8 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHExhaust Cayman GT4 - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Run these
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
cargraphic also have their Manifolds for the GT4 also now, I run these on my 987.2 they are sweet.
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
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
Leading evidence: 'Run these' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect vacuum tubes' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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 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
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Disconnect vacuum tubes
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
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T033922Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hey,
I was wondering if anyone already fitted an aftermarket exhaust to a GT4, I really like the sound the car makes but I don't find it loud enough (inside the cabin at least)...
I do think that if I find a way to have the PSE valves open all the time it will make it better, I feel the car really muted if Im driving a bit slower. I previously had a V8 Vantage with the exhaust fuse removed and it made a glorious noise from 1rpm basically, it always felt like an event to drive it
Any ideas on how to proceed?
Thank you,
Jorge
IPE make a full system also prob worth 20bhp due to less cats if you can get a tune to stop the detune Porsche put on it !
https://www.youtube.com/watch?v=IEnZglTC_2A
Fab speed also make a manifold
https://www.youtube.com/watch?v=9P6MN6omPIw
cargraphic also have their Manifolds for the GT4 also now, I run these on my 987.2 they are sweet.
Edited by PorscheGT4 on Tuesday 6th October 09:03
Jmachado said:
Hey,
I was wondering if anyone already fitted an aftermarket exhaust to a GT4, I really like the sound the car makes but I don't find it loud enough (inside the cabin at least)...
I do think that if I find a way to have the PSE valves open all the time it will make it better, I feel the car really muted if Im driving a bit slower. I previously had a V8 Vantage with the exhaust fuse removed and it made a glorious noise from 1rpm basically, it always felt like an event to drive it
Any ideas on how to proceed?
Thank you,
Jorge
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
gtsralph said:
Disconnect the vacuum tubes running to the rear boxes and plug them (to stop losing vacuum which is shared by cooling system valves and which causes cooling fault messages) and it will run in default noisy mode all the time.
This was covered in detail on the 991 GT3 thread although many found the resultant exhaust too noisy for day to day driving.
As above - the maximum noise levels at tracks are being monitored far more rigorously than in the past.
My 987.1 on unmodified PSE measures 98db static with the valves open, so not a lot of room to manouver.
