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Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

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YOUR RESEARCHStainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

Leading reported evidence

Replace back boxes

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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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
It's a stock system that I replaced the back boxes with stainless Dansk sport items.
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Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

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Leading evidence: 'Replace back boxes' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace back boxes' (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 on track and i'm concerned

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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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.

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Performed · outcome unconfirmed · Original poster
The car is used on track and I'm concerned that the car won't pass a 98dB static noise test with non standard cans fitted?!
Original post Read captured discussion
Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

Test with non standard cans fitted

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

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Suggestion · Original poster
The car is used on track and I'm concerned that the car won't pass a 98dB static noise test with non standard cans fitted?!
Original post Read captured discussion
Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

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 back boxes

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
It's a stock system that I replaced the back boxes with stainless Dansk sport items.
Original post Read captured discussion
Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

Test with non standard cans fitted

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
The car is used on track and I'm concerned that the car won't pass a 98dB static noise test with non standard cans fitted?!
Original post Read captured discussion
Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

Use on track and i'm concerned

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 · Original poster
The car is used on track and I'm concerned that the car won't pass a 98dB static noise test with non standard cans fitted?!
Original post Read captured discussion
Stainless exhaust silencers and track noise limits! - Page 1 - 911/Carrera GT - PistonHeads UK

Coverage and how to read this overview

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.

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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

My Manthey exhaust measured 107db at Snetterton about 10 days ago... Draw your own conclusions...

POST 2 / ORIGINAL POSTEROriginal post

Hi, I'm considering fitting a pair of aftermarket stainless exhaust silencers to my 3.4 996 as my standard units are past their best (and sound a bit rubbish to be fair)! The car is used on track and I'm concerned that the car won't pass a 98dB static noise test with non standard cans fitted?! Anybody had any experience of similar? Edited by Sifly on Thursday 23 October 22:03

POST 3Original post

Never had them tested, but I'd like to get my exhaust volume measured just for interests sake. It's a stock system that I replaced the back boxes with stainless Dansk sport items. That was earlier this year and it's been getting louder ever since.

POST 4Original post

My friend has Carnewal mufflers on his 996 3.4 and passed noise testing at Bedford so should be fine for everywhere. Added bonus is they are excellent VFM. Also, they can be done on an exchange basis. My friend send his off and they were in s te order, Gert still gave him about £150 for them. http://www.carnewal.com/products/P96/p96195/Carnew...

POST 5Original post

Mario149 said: My friend has Carnewal mufflers on his 996 3.4 and passed noise testing at Bedford so should be fine for everywhere. Added bonus is they are excellent VFM. Also, they can be done on an exchange basis. My friend send his off and they were in s te order, Gert still gave him about £150 for them. http://www.carnewal.com/products/P96/p96195/Carnew... OP will need to check whether Gert at Carnewal has any exchange boxes as I enquired for a friend & was told no & my friend used it as an excuse to go to Belgium & he did the exhaust mods whilst he waited & refitted the boxes. There are other replacement possibilities including Dansk & also Design 911 though you need to factor for replacement clamps throughout as most fall to pieces after a couple of years due to rust in my experience. Alternatively you could buy a decent pair of used boxes off the Web & get a bypass pipe mod?

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