8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPSE + K&N
Reported or suspected cause
oil
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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Reported cause
It seemed that there was some body of evidence to suggest that it was the oil from the K&N oiled gauze filter that was polluting the MAF.
Leading evidence: 'oil' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'oil' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install 2 of these, one' (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.
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I have installed 2 of these, one on my own car and am very pleased with it.
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
I installed the K&N CAI on my 2001 996, and YES, I got the CEL light within 100 miles.
Use on the aem filter, thus the dry filter nomenclature
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
First....NO OIL is used on the AEM filter, thus the DRY FILTER nomenclature.
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
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Suggestion
From personal experience , I would highly recommend the K&N CAI system for your 996.
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Suggestion
After some reflective thought, I would STRONGLY URGE,COERCE,or ADMONISH you to replace the original supplied oiled gauze K&N filter with the AEM filter.
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.
8 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
With the AEM installed, ther is no oil to foul the MAF and no more CEL lights to contend with.
I have a PSE on my C4S and I love every second of it. But now comes the time when I want to add more on my baby. I was told that the K&N Air filter kit adds about 25Hp (or there about). However I understand that it also changes the sound of the car.
So my questions are
1) Does it really bump the BHP by 25?
2) Is it safe for the engine?
3) Will it totally change my sound? If so will it be so loud that I probably will get pulled over around every street corner (I don't live in cal but in mass)
Thanks for your answers
Rivarama - do you honestly think that Porsche would leave 25 HP on the table for the price of an air filter. To answer your question, no you won't get ANY additional power. Not much more intake noise either. Your engine is basically an air pump. It needs 3.6 liters x the rpm worth of air. The OEM air filter can supply more air than the engine can use. Using a filter which allows more air to flow at the expense of less filtering (not good) will accomplish nothing.
Best,
+1
Plus it looks REALLY GHETTO - its a crappy cheap tin box that you have to drill holes in your car to mount and then put flacky foam tape around the edges...I bought one, THEn checked, then sold it un-used...
Not only will it NOT add BHP but it has been shown to (in some cases) rob power... Not sure about the sound.. but at that point I didnt care anymore and dumped it off on ebay....
NEXT!
LOL
Ed
is this for real?..............
posted by another member from the other side..............
From personal experience , I would highly recommend the K&N CAI system for your 996. I am convinced that K&N did considerable research in designing the system and optimized the tuned port length for the engine. I have installed 2 of these, one on my own car and am very pleased with it. However.....I would suggest that you replace the supplied filter that came in the kit with an AEM DRY FILTER 21-204DK. The AEM filter is a great filter and has several advantages over the supplied filter that came in the kit.Lets look at them.
After some reflective thought, I would STRONGLY URGE,COERCE,or ADMONISH you to replace the original supplied oiled gauze K&N filter with the AEM filter.
First....NO OIL is used on the AEM filter, thus the DRY FILTER nomenclature. The filter is indeed dry and uses NO OIL. This is extremely important in the sense that many a foul word has been slung at the oil used in the supplied filter and its ill effect upon the sensitive MAF that is downstream in the system. Many have lamented that it is the oil from the filter that has caused their MAF to cease functioning properly and cause a DTC to be dispatched to the CEL light in the dash. I cannot verify if this is correct or not....however it seems prudent to me to remove the oil from the system and thus remove the possibility of the oil indeed "wasting" the fragile MAF, and if you can do it while getting better filtration...well that is way cool. AEM use to manufacture oil /cotton gause based fiters and halted production of them in favor of their cutting edge DRY FILTER media,I am glad they did.I might add at this juncture that I have NO affiliation with AEM or K&N.
Second...The AEM is a very high flow filter. I spoke with their tech and he informed me that the AEM 21-204DK filter had a max air flow rating of 875 CFM. The 3.4L engine at 7000 rpm and 100% VE% ( in reality it is closer to 85%) needs about 420 cfm...soo the AEM filter will supply roughly TWICE the needed cfm for the engine. Wow, I know I can rest easier now.
Third..The AEM filter has an very high dust holding capacity while maintaining an very high degree of filtration, down to as small as 1 micron in size. That is quite impressive and quite important as I live in the Southwest .
Fourth...The AEM is lighter and thus has less weight on the end of the "snorkel", ok.. the tuned port for you wise guys, if in fact that was a problem with the system which it is not from my experience.
Fifth...The AEM is washable and reusable. It very strong and can be washed and reused many times in the future.
Sixth....The AEM is a direct replacement for the originally supplied filter and fits nicely to boot.
Seventh...The dry media that is used in the manufacture of the filter is water repellant or hydrophobic ( I think of my cat as hydrophobic...not an air filter) but not water proof. For those of you that are overly concerned about ingesting water into your engine, keep your car out of the lake or do as I did. I purchased a INJEN HYDRO-SHIELD PRE-FILTER (large, X-1034) that simply slips over the filter and provides some protection from water ingestion. The Hydro-shield is again water resistant or hydrophobic and NOT water proof.I just love the word hydrophobic, I hope I get the chance to use it in the future.
Lastly...did I mention that the filter was dry and did not use oil....oh yes I did, but is important enough to mention it again as it seems that many have written about the problem of using an oiled gause filter and the alledged ill effect on the MAFthat can result. The AEM filter puts all those fears to rest and performs better .... what more could one ask!
I have read on this thread that installing the K&N CAI system was tedious and akward...well not really. I have done two of them and I find that I can put it together in about an hour . While you are doing the install and you are "in there" , go ahead and put a plenum on and relish the growl and midrange punch ! I am absolutely delighted with my setup (along with some freeflow mufflers) .
SOOOO.....If I was looking for a CAI system for my 996, I would go on ebay and buy the K&N CAI system CHEAP from someone who was fed up with the oil from the original filter fouling their MAF and the hassle with the CEL light. I would then buy the AEM filter and replace the K&N filter in the CAI system. With the AEM installed, ther is no oil to foul the MAF and no more CEL lights to contend with. I can speak from personal experience as to this issue. I installed the K&N CAI on my 2001 996, and YES, I got the CEL light within 100 miles. But I simply fell in love with the "DEEP GUTTERALGROWL" sound of the engine pulling up through the midrange and quick rush to rev limiter that I experienced. I thus took on a long and ardous research of both this forum and of Rennlist to ascertain the problem. It seemed that there was some body of evidence to suggest that it was the oil from the K&N oiled gauze filter that was polluting the MAF. I stumbled onto the AEM website and ....eureka, The answer was staring me in the face from cyberland. I installed the AEM DRY FILTER in place of the K&N oiled gauze filter along with a new MAF and I have been in bliss ever since.I have been about 600 miles with no CEL light and nothing pending! WOW, I have to take a breath for a moment here to calm down.
Well before I sign off did I mention that the AEM uses NO OIL.....oh yes I did and please excuse me for being redundant....and did I also mention that I relish the "deep gutteral growl" of the CAI system....it seems as I did....mea culpa.
I hope this helps in some small way.
