34 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHK&N question.
Leading reported evidence
Replace filter
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
It fried my MAF,changed the filter to an AEM dry filter.
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Suggestion
Put on the brand new K&N kit just like that in the photo (with factory pre-oiled new filter) and almost immediately got a check engine / visit workshop message.
Leading evidence: 'Replace filter' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'good call' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check engine / visit workshop message' (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
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I do know that the MAF was changed on my car earlier this year and I am still trying to chase down a major misfire during cold conditions which I think are related to this relatively new MAF being bad too (no CEL lights).
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
Last night I removed the whole K&N intake, used MAF cleaner to spray the MAF sensor wire off (which I had also done before installing the K&N), and replaced it with an EVOMS one and today the check engine light turned off by itself on the first trip.
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
I'm running the cat delete pipes with all 4 O2 sensors in place and have never had a check engine light for that either yet that is one of the biggest complaints about those pipes.
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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Performed · outcome unconfirmed
I'm running the K&N with the older style FabSpeed cat delete pipes and a Gundo/Fister hacked exhaust and honestly the only thing I've noticed is a loss of low end torque and a sweet exhaust note.
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Check engine / visit workshop message
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
Put on the brand new K&N kit just like that in the photo (with factory pre-oiled new filter) and almost immediately got a check engine / visit workshop message.
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
I put a Decklid with Hydraulic Wing from a Turbo onto my wife's 2005 997.1 C2S and needed to change from the stock airbox to an aftermarket intake in order to make space for the wing hydraulic rams to come down on the sides of the engine compartment and also to allow space for the centrally mounted engine bay fan of the turbo deck lid (non-turbo is offset to the side a bit).
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
I do know that the MAF was changed on my car earlier this year and I am still trying to chase down a major misfire during cold conditions which I think are related to this relatively new MAF being bad too (no CEL lights).
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
Last night I removed the whole K&N intake, used MAF cleaner to spray the MAF sensor wire off (which I had also done before installing the K&N), and replaced it with an EVOMS one and today the check engine light turned off by itself on the first trip.
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 wire element of the MAF sensor needs to face the air flow coming into the intake, because of the changing of the location with the new K&N tube you also need to flip the connector inside the boot.
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
I'm running the cat delete pipes with all 4 O2 sensors in place and have never had a check engine light for that either yet that is one of the biggest complaints about those pipes.
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.
34 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
6SpeedOnline: 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
Can someone give me some pro's and con's on having a k&n? I have a 2004 c4s
The car came with it. My questions are, are their any benefits with out having a tune on the car? I'm having issues when it rains, other mods are an exhaust.
Any info would be great.
Thanks in advance.
Kevin
Everyone has their opinion on this thing. I have had it for a long time. Didn't notice any performance change,Maybe a hint of sound change. It fried my MAF,changed the filter to an AEM dry filter. I think you're better off with a performance filter in the stock airbox.
Yah the only thing about changing filters is the convenience of not having to buy a new one when you can clean the K&N or AEM. IMO the dry flow is the best option since Porsche MAF sensors don't like oil from the filter on them.
I have one, it is a stock replacement style I don't believe that they really add much in performance whether they are a kit type or stock replacement, maybe a bit of sound difference. The problem people have with the MAF is when they clean and re-oil the filter they use too much oil and that will cause an issue, use care and this will not happen, mine has been fine, never a problem. If you do have a problem the MAF can be cleaned and that should resolve things.
I've been useing one for a year now along with a silicone air intake hose, no problems. Does it increase power? Who knows, but when you give it throttle you can actually hear the air being sucked in, that's cool!
As mentioned, the MAF usually goes because the filter is over oiled or oiled on both sides, you should only oil the intake side.
Along with K&N, we also carry
Pipercross Air Filters
that you might be interested in if you want to stick with the stock filter. Airborn dirt particles quickly clog conventional paper or cotton-gauze style filters, resulting in a pressure drop that robs the engine of air flow and power. Thanks to deep foam construction, Pipercross filters offer a drastically higher dirt-carrying capacity, allowing air to flow at high rates even after many miles of use - a claim that conventional filters cannot make.
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I put a Decklid with Hydraulic Wing from a Turbo onto my wife's 2005 997.1 C2S and needed to change from the stock airbox to an aftermarket intake in order to make space for the wing hydraulic rams to come down on the sides of the engine compartment and also to allow space for the centrally mounted engine bay fan of the turbo deck lid (non-turbo is offset to the side a bit).
Put on the brand new K&N kit just like that in the photo (with factory pre-oiled new filter) and almost immediately got a check engine / visit workshop message. Used durametric pro to clear the error and it said something like MAF sensor before intake or some strange positional message. Drove it this way for about a month and the check engine light never turned off by itself and always came back soon after I cleared it with Durametric.
Last night I removed the whole K&N intake, used MAF cleaner to spray the MAF sensor wire off (which I had also done before installing the K&N), and replaced it with an EVOMS one and today the check engine light turned off by itself on the first trip. I have K&N intakes on a number of my other vehicles without any issues, but this did not seem to work well on this C2S. One of the deficiencies of the K&N kit is that all the pipes that you have to clamp down on are plastic - with the EVOMS kit the pipe from the filter to the throttle body is metal and only the airbox surround is plastic, which is a much higher quality design so that you can get the clamps good and tight for no air entry that doesn't pass by the MAF.
Returned the K&N to Advance Auto today for a full refund and am sticking with the EVOMS and a non-warning light dash. I also have a Fabspeed Carbon Fiber Competition Air Intake on my RUF Supercharged 997.1 C2S and that one doesn't throw any codes either - just this K&N one.
Just my 2 cents.
Pete
I've been running the K&N CAI for a year without any issues or check engine light.
I wrapped the filter inside and out with newspaper and let that soak up the excess filter oil overnight.
If you have the MAF installed backwards (which you can do) it will cause issues also.
phantom, interesting point about installing the MAF backwards - since it's not "keyed" and is symmetrical, that's surely a possibility. Should the side with the sensor wire face to the front, back, Driver side, or Passenger Side (there are obviously only 2 options, I just don't recall the orientation of the wire to the screw holes and the intake). Thanks.
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The wire element of the MAF sensor needs to face the air flow coming into the intake, because of the changing of the location with the new K&N tube you also need to flip the connector inside the boot. It's all explained in the install directions.
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My kit came with the filter "sock", "cover" whatever they call it but It seems to help cause I've not had any issues with driving in the rain.
I might be the only 996 owner with a K&N CAI that hasn't had all the problems people mention.......
The PO of my car installed one with the sock. Sounds awesome (compared to stock airbox and stock air filter), but I too live in a rainy environment and I did not feel comfortable with it. I do know that the MAF was changed on my car earlier this year and I am still trying to chase down a major misfire during cold conditions which I think are related to this relatively new MAF being bad too (no CEL lights). At the end of they day, peace of mind is more important to me than anything else, so I am OK with the stock system, though I am looking for one of those "famous orange caps" to yield the same sound result, but without any of the other negative aspects of the K&N CAI. Hell, I'd trade my K&N for a new MAF!
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I imagine your car still has the retractable wing, mine doesn't. The misha wing on my car has vents directed right to the cai, so when it rains it drips right on it causing it to have issues.
If your talking about the "benefits without the tune" question.....The only way to get the most out of the intake/exhaust set up is to get the ECU flashed.
I'm running the K&N with the older style FabSpeed cat delete pipes and a Gundo/Fister hacked exhaust and honestly the only thing I've noticed is a loss of low end torque and a sweet exhaust note.
That being said the companies selling these parts all boast increased performance and power some providing dyno sheets. The only way to know if it has done any improvement to your car is to dyno the car before and after install of the parts and yes that's a complete pain in the ***.
My next course of action is adding the IPD plenum and flash the ECU and see where that get's me. The IPD plenum seems to be what people say give these NA 911 motors the biggest boost in overall performance.
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I hope that did help, I can only speak of my experience as you know others have run into different issues or problems etc with different mods.
I think a lot of the problems are guy's cutting corners on the installs not completely following the procedures put in place or really not knowing what they're doing.
I'm running the cat delete pipes with all 4 O2 sensors in place and have never had a check engine light for that either yet that is one of the biggest complaints about those pipes.
By no means do I consider myself an expert on all things Porsche but I've worked on sports cars for over 20yrs even built and raced a 93' RX7 track car doing 80% of the work myself and I've found that a lot of the forums and the DIY tutorials make some of the jobs seem way harder then they really are.
There is tons of useful info but sometimes you have to sift through some B.S.and misinformation by guys that don't even own the car in question to get to it.
The K&N Drop in Filter is great but dont do the K&N Cold Air Intake, its a hot air intake and you will lose horsepower and the filter gets super dirty all the time.
+1, the drop in filter with the silicone air intake hose is perfect, sounds good too. IMO, the only advantage to the K&N type filters are the looks.
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