13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCat bypass: will it ruin my car for moving or resale?
Leading reported evidence
Install on a motor vehicle by the vehicle manufacturer except
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
Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle.
Cat bypass: will it ruin my car for moving or resale?
Frequently discussed work
Check we seemed
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
If we weren't 100% stock we may not have passed, and previously when our beautiful Jag failed a smog check we seemed to have been put in a special program where we had to do it every year to prove to them we were ok.
Cat bypass: will it ruin my car for moving or resale?
Read full discussion summary
Leading evidence: 'Install on a motor vehicle by the vehicle manufacturer except' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check we seemed' (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.
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
Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle.
Cat bypass: will it ruin my car for moving or resale?
Use 1999 mustang cobra engine
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
Side note: when I built my FFR Cobra, I used a 1999 Mustang Cobra engine.
Cat bypass: will it ruin my car for moving or resale?
Check we seemed
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
If we weren't 100% stock we may not have passed, and previously when our beautiful Jag failed a smog check we seemed to have been put in a special program where we had to do it every year to prove to them we were ok.
Cat bypass: will it ruin my car for moving or resale?
Recommend fabspeed cat bypass
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
They recommend fabspeed cat bypass for sound, performance, and cost, and say no OEM cat replacement is available.
Cat bypass: will it ruin my car for moving or resale?
Frequently discussed actions (6)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check we seemed
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
If we weren't 100% stock we may not have passed, and previously when our beautiful Jag failed a smog check we seemed to have been put in a special program where we had to do it every year to prove to them we were ok.
Cat bypass: will it ruin my car for moving or resale?
Install on a motor vehicle by the vehicle manufacturer except
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
Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle.
Cat bypass: will it ruin my car for moving or resale?
Install on the motor vehicle
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
Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle.
Cat bypass: will it ruin my car for moving or resale?
Replace such device or system
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
Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle.
Cat bypass: will it ruin my car for moving or resale?
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.
13 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Reputable local shop says my cats are bad. They recommend fabspeed cat bypass for sound, performance, and cost, and say no OEM cat replacement is available.
if I get a fabspeed cat bypass, I�m worried about resale value, possibility of issues passing emissions, etc. currently live in atlanta and they say it won�t be an issue here, but that�s one guy�s belief.
Can anyone speak with experience about emissions, resale value, etc with a cat bypass?
thanks!
Just the cat bypass will cause your car to fail emissions in any state that requires a test.
It will also give you a constant CEL.
If you add the mini catalytic converters (
https://www.fabspeed.com/universal-9...nverters-pair/
) it will pass some states emissions tests and you won't get a CEL.
It will fail any that require a visual inspection.
Resell could be affected if you don't replace the cats before selling.
There are cheap OEM style replacements available here:
https://www.rockauto.com/en/catalog/...converter,5808
You can also get a x-pipes with 200-Cell Cats(
https://www.fabspeed.com/porsche-996...ipe-1999-2004/
) for higher flow, but again it might not pass emissions tests without the mini-cats.
Lots of people run the Top Gear or Design911 200 cell cats(same product as far as i can tell); affordable and mine seem well made. I don�t know how effective they are in terms of emissions but have to be better than nothing.
Just got our first California smog check. I was surprised the tech did a thorough look on top and under the engine, and I couldn't clearly see but his computer screen seemed to have pictures of items for him to look for. If we weren't 100% stock we may not have passed, and previously when our beautiful Jag failed a smog check we seemed to have been put in a special program where we had to do it every year to prove to them we were ok.
If you can live without your cats/car a few weeks there is an option to send out your cats to have 200 CELL honeycombs put in and retain the stock look and pass emissions.
http://www.carnewal.com/products/996...nge-Sport-Cats
I�m guessing most states have a similar law. I have personally seen it prosecuted.
MOTOR VEHICLES
Chapter 316
STATE UNIFORM TRAFFIC CONTROL
316.2935
Air pollution control equipment; tampering prohibited; penalty.�
(1)(a) It is unlawful for any person or motor vehicle dealer as defined in s.
320.27
to offer or display for retail sale or lease, sell, lease, or transfer title to, a motor vehicle in Florida that has been tampered with in violation of this section, as determined pursuant to subsection (7). Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle. All motor vehicles sold, reassigned, or traded to a licensed motor vehicle dealer are exempt from this paragraph.
. . .
(5)
Any person who knowingly and willfully violates subsection (1) shall be punished as follows:
(a) For a first violation, violators shall be guilty of a misdemeanor of the second degree, punishable as provided in s.
775.082
or s.
775.083
, except that a motor vehicle dealer shall be guilty of a misdemeanor of the first degree, punishable as provided in s.
775.082
or s.
775.083
.
(b) For a second or subsequent offense, violators, including motor vehicle dealers, shall be guilty of a misdemeanor of the first degree, punishable as provided in s.
775.082
or s.
775.083
. In addition, the Department of Highway Safety and Motor Vehicles may temporarily or permanently revoke or suspend the motor vehicle dealer license authorized pursuant to the provisions of s.
320.27
.
Side note: when I built my FFR Cobra, I used a 1999 Mustang Cobra engine. Since Florida titled it as a 1965, had to meet emission requirements for that year (none). Thus, legally allowed to not have cats and flash emissions from ECU.
This is a source reference. Confirm exact model applicability in the original material.
