5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHProblem with Fabspeed Mufflers
Leading reported evidence
Install fabspeed mufflers
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 · Original poster
I have just installed Fabspeed mufflers on my MY'99 C4.
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 · Original poster
I've had the OBD-II checked on my mate's PST-2 (He used to work for an official Porsche Center and is now an independent Porsche Specialist) and no fault codes were logged so I have to assume the variocams and other systems that might immediately account for the odd symptoms are working correctly.
Leading evidence: 'Install fabspeed mufflers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check on my mate's pst-2 (he' (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 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 · Original poster
The -ve battery terminal was removed after the install to reset the OBD-II and I have run the car approx 100 miles since including some hard acceleration runs (up to 155 mph - bad boy) to allow the electronics to re-map correctly.
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 · Original poster
I've had the OBD-II checked on my mate's PST-2 (He used to work for an official Porsche Center and is now an independent Porsche Specialist) and no fault codes were logged so I have to assume the variocams and other systems that might immediately account for the odd symptoms are working correctly.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check on my mate's pst-2 (he
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 · Original poster
I've had the OBD-II checked on my mate's PST-2 (He used to work for an official Porsche Center and is now an independent Porsche Specialist) and no fault codes were logged so I have to assume the variocams and other systems that might immediately account for the odd symptoms are working correctly.
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 · Original poster
The -ve battery terminal was removed after the install to reset the OBD-II and I have run the car approx 100 miles since including some hard acceleration runs (up to 155 mph - bad boy) to allow the electronics to re-map correctly.
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: 20261027T053112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi everyone,
I have just installed Fabspeed mufflers on my MY'99 C4.
The installation went well (aside from some VERY rusty nuts on both the muffler brackets and the sleeves that attach the muflers to the catalysts - the UK's rather inclement weather not helping here!!). The mufflers clear the heatshields on both sides of the car (at their closest point by the rear lower corner of the muffler) by about a quarter inch or so and the tips clear the rear apron correctly. There is no contact between the mufflers and the car's bodywork. All the joints are gas-tight - if I block off the tailpipes with a hand with the car cold and idling there are no leaks as the pressure builds.
The -ve battery terminal was removed after the install to reset the OBD-II and I have run the car approx 100 miles since including some hard acceleration runs (up to 155 mph - bad boy) to allow the electronics to re-map correctly. At full throttle and over 5000rpm the souind is absolutely amazing (if frighteningly loud)!
The problems I have are these:
1) Each side sounds different and varies differently with different rpms and throttle openings - WEIRD!
2) There is a massively loud boom throughout the car at 2000 - 3000rpm even at very small throttle openings. Very very loud and unpleasant.
I've had the OBD-II checked on my mate's PST-2 (He used to work for an official Porsche Center and is now an independent Porsche Specialist) and no fault codes were logged so I have to assume the variocams and other systems that might immediately account for the odd symptoms are working correctly.
Does anyone have any idea what might be causing the problems?
Hope you can help
Thanks, Ian W
Ian: does the booming change as the engine heats up? I ask because I have a set of B&B TriFlows on my M5, and they are very loud and boomy when the car is cold started, but the boom goes away quickly with a little heat.
BTW I have GHLs on my 996; very close fit, but no problems.
Steve
99 996
00 M5
PS: what area of England is your home? I lived in Suffolk for a few years; a very easy drive to both Snetterton and the Lotus factory.
Ian,
Where are you?
Is this a one off boom then its gone or do you mean it is a loud drone (resonance) that stays around until you get past a certain revs?
If you're nearby we could compare setups as I have the Maxflow system too.
Cheers,
Hi Scouser
I'm only in Manchester (live just near the airport) so can get together if you like - would be interesting to compare installations as you suggest.
The sound is an overpowering droning that is always there between 2-3000rpm irrespective of the engine temperature and goes at higher rpm.
Kindest
Ian W
I am in South Wirral just down the M56 J6. approx 30 miles to the airport from here. Fancy a trip over? I would be able to hear you coming
PM me and we can arrange something.
Cheers,
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