21 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFS - High Flow / Sport Cats
Leading reported evidence
Install so, they're unlikely
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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 · Original poster
They produced CELs a couple times during the time I had them installed - so, they're unlikely to pass an emissions test.
Leading evidence: 'Install so, they're unlikely' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install so, they're unlikely' (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.
Install with factory mufflers they add an unpleasant metallic resonance
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
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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 Bad: When installed with factory mufflers they add an unpleasant metallic resonance to the exhaust sound.
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
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Suggestion
Nope, I got lazy after the oil change, tilling the garden, washing the dog, and replacing the drip irrigation in Ms.
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
Nope, I got lazy after the oil change, tilling the garden, washing the dog, and replacing the drip irrigation in Ms.
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.
21 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 · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T203514Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Bought these as new online a couple of years back as Agency Power units, but they are unmarked and I received no paperwork. So, consider them of unknown manufacturer. I used them for ~2K miles and found absolutely nothing to like about them & went back to the factory ones.
The Bad: When installed with factory mufflers they add an unpleasant metallic resonance to the exhaust sound. The sound might be more compatible with sport mufflers, but assume it won't be. They produced CELs a couple times during the time I had them installed - so, they're unlikely to pass an emissions test.
The Worse: You're probably not going to like them, either & have to swap back to something else.
The Good: They are made of stainless steel and lighter than the factory cats. May be an alternative to bypass pipes. Can't think of anything else positive.
Asking $250 + actual shipping from 25301.
I was going to buy these but you ad talked me out of it!
I have the Top Gear cats from the UK and they are awesome, more power, no cel and sound mean as hell. They look almost identical to yours, they must be different inside.
I installed the
200 Cel Cats from Top Gear in the UK
(See Below) with FISTER D Cans. They look similar to yours but sound mean as hell...especially above 4K. I have posted this video:
FisterD w/ TopGear 200 Cel Cat Video
Sorry for the zombie project update...good news! The world's worst sport cats do not sound bad at all with my Fister mufflers on my '99 C4. Only about 100 miles on them so far, but overall very pleased. A little rumbly when you're at idle/low RPM, a brutish stock-car undertone when you're deep into it, and the resonant frequency at about 4250 RPM is even likable. I expected to be only moderately disappointed; instead, I'm cautiously optimistic, even pleased.
