fullymatted.
Back to search
Rennlist

Will 3.8L Mufflers Fit a 996 C4S?

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

Discussion summary

YOUR RESEARCHWill 3.8L Mufflers Fit a 996 C4S?

Leading reported evidence

Use same stock (non pse muffler)

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

The 997 (non S) has a 3.6L engine and the 997S has a 3.8L engine, but I think (not completely sure) that they both use the same stock (non PSE muffler).

Original post Read captured discussion
Will 3.8L Mufflers Fit a 996 C4S?
Read full discussion summary

Leading evidence: 'Use same stock (non pse muffler)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use same stock (non pse muffler)' (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 · 6 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.

Use same stock (non pse muffler)

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

The 997 (non S) has a 3.6L engine and the 997S has a 3.8L engine, but I think (not completely sure) that they both use the same stock (non PSE muffler).

Original post Read captured discussion
Will 3.8L Mufflers Fit a 996 C4S?
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.

6 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.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link

However, I have read conflicting reports: some say it helps, others say no difference.

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

Generation: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Quick question: Does anyone know if the mufflers off a 3.8L 997S will fit my 996 C4S? TIA

POST 2Original post

I don't know about the mufflers, but the headers do. I have 997S (355 HP engine) headers on my 2002 996 C4S (320 HP, so, according to Porsche, slightly less restricted). However, I have read conflicting reports: some say it helps, others say no difference. As for the muffler, I let Porsche put a "J" (1.5"), or what some call Mark II mod. I did it mainly for the sound - and love it. John

POST 4Original post

COs - good question. The 997 (non S) has a 3.6L engine and the 997S has a 3.8L engine, but I think (not completely sure) that they both use the same stock (non PSE muffler). Here is a pic of a stock 997 muffler that someone posted over a year ago. They had done the "996 PSE mod" to the stock muffler. The stock 997 exhaust has a single outlet pipe like the 996 muffler, but the 997 PSE is a true "two pipe" outlet exhaust (second pic), a larger one and a smaller one. Sorry, but I don't have a pic of just the 997 PSE muffler itself to be able to show the difference.

POST 5 / ORIGINAL POSTEROriginal post

Thanks Tim, reason I asked is coz' I'm 2nd in line to a possible 3.8L set of cans free + shipping. It was already taken, but the person hasn't acted on it yet, so the owner told me he'd let me know if that doesn't happen. I want to be sure before I get them shipped to me.

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