fullymatted.
Back to search
911uk

Exhaust changes?...What to do?...

Add to repair workspace
Open repair workspace
Original source
8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHExhaust changes?...What to do?...

Leading reported evidence

Run fabspeed supercup decats & i reverted

Suggestion or failed attempt

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 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

Yep, 120dB was running fabspeed supercup decats & I reverted to Oettle mufflers, the fabspeed muffler bypass was way too loud.

Exhaust changes?...What to do?...
Read full discussion summary

Leading evidence: 'Run fabspeed supercup decats & i reverted' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run fabspeed supercup decats & i reverted' (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.

Read captured replies

1 matching discussions · 8 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Run fabspeed supercup decats & i reverted

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

Yep, 120dB was running fabspeed supercup decats & I reverted to Oettle mufflers, the fabspeed muffler bypass was way too loud.

Exhaust changes?...What to do?...
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.

8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 911uk: 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: 20261027T020439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Right guys i have a 3.4 C2 and Im looking for a little more power so im looking at getting a revo remap. But before i do that i wanted to play around with the exhaust system to get the most from the remap so i have recently got hold of some equal length manifolds. Now the question is: 1- Do i also go for cat bypass pipes and sport mufflers (something like Milltek) 2- Do i do the above but do the bypass mod on my standard mufflers Would there be any difference in power between a sport muffler and standard muffler? :dont know:

POST 2Original post

Hi, For a bit more grunt go for: de-cat pipes - check out fabspeed.com sport muffler - fabspeed or Oettle Induction kit - K&N etc and get a live remap rather than an off the shelf like Revo etc to get the best out of your car, done on a rolling road, costs more but alot better. Being realistic expect a 5-10% power increase. Or go down the Supercharger route, search vividracing.com Noise wise, mine was about 120db so no track days Cheers

POST 3 / ORIGINAL POSTEROriginal post

Brumbrum when you say yours was about 120db i take it you had decats and sport mufflers? 120db is a lot Im really into my trackdays at the mo so i think i'll have to have a re-think. Can you suggest any tuning companies that could do a live map on my car?

POST 4Original post

Yep, 120dB was running fabspeed supercup decats & I reverted to Oettle mufflers, the fabspeed muffler bypass was way too loud. Most tracks have a max of 105dB limit in the UK on a noisy day. Performance wise: I would seriously consider going down the SC route, tt performance & something abit different, 150hp increase, so pretty good value. Oettle mufflers are basically standard mufflers with the PSE bypass pipe welded on, so it's like a PSE always on. Exhaust wise: I just posted this up earlier: Standard Car: 99 dB X51 Car: 102 dB + PSE: 99 dB with PSE Off + PSE: 108 dB with PSE On Oettle muffler + Fabspeed decat: 115-120dB Systems like RSR's, Kresseig etc are going to be abit higher than the PSE, as you can see your going to struggle noise wise with anything other than standard!. Cheers :thumb:

POST 5Original post

Can you just clarify this for me please. PSE On / Off On = noisy Off = quieter?

POST 7Original post

Would there be any difference in power between a sport muffler and standard muffler? No, only makes the car sound nicer i'm afraid.

POST 8Original post

sorry similar subject. Won't cat bypass pipes fail the MOT? Or do you just swap them back and forth once a year?

This is a source reference. Confirm exact model applicability in the original material.