fullymatted.
Back to search
Rennlist

Topgear Cats w/muffler bypass for little dough...

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

Discussion summary

YOUR RESEARCHTopgear Cats w/muffler bypass for little dough...

Leading reported evidence

Use stock 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 also had a buddy do a muffler bypass on a pair of good used stock mufflers.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...
Frequently discussed work

Replace front suspension wear items

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

This winter I plan to start replacing front suspension wear items.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...
Read full discussion summary

Leading evidence: 'Use stock mufflers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'last drive until spring' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace front suspension wear items' (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 · 2 captured posts examined · 0 partial discussions

Compare 2 other evidence results

last drive until spring

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
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.

Suspected cause · Original poster

Today is most likely the last drive until spring, so I'll try to get some sound clips and update then.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...

Replace front suspension wear items

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 · Original poster

This winter I plan to start replacing front suspension wear items.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...
Frequently discussed actions (2)

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

Replace front suspension wear items

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

This winter I plan to start replacing front suspension wear items.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...

Use stock mufflers

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

I also had a buddy do a muffler bypass on a pair of good used stock mufflers.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...
Reported and suspected causes (1)

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

last drive until spring

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause · Original poster

Today is most likely the last drive until spring, so I'll try to get some sound clips and update then.

Original post Read captured discussion
Topgear Cats w/muffler bypass for little dough...
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.

2 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: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I decided to replace what I believe to be the original cats and O2 sensors in my '99 C2. I've never had any cels pointing to either. The mufflers did show some seam rust/rot on the bottoms. Rather than spend $2k plus on a pair of 200 cell x-pipes, I decided to give a a pair of Topgear non x pipes a try. They were only $577 shipped to my door. The quality of of the welds and the overall appearance is fantastic for this price point. The fit and installation was spot on with no issues. I also had a buddy do a muffler bypass on a pair of good used stock mufflers. The cost was $200 including the stainless tubing. All in I'm at $777 dollars. The car sounds fantastic and seems more responsive and no CELs. It could be the cold air, since it was about 14 degrees today. I also at this time replaced all 4 O2 sensors, new spark plugs and late style coils. We'll see how these cats last vs the $2k versions. Also, I am at about 3500 miles on a full Stage 1 FSI engine reconstruction w/IMS solution. Today is most likely the last drive until spring, so I'll try to get some sound clips and update then. This winter I plan to start replacing front suspension wear items.

POST 2Original post

[Image-only post; no author-written text. Original image references:] https://rennlist.com/forums/graemlins/rockon.gif

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