17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHK& N swap.
Leading reported evidence
Install by the po
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Leading evidence: 'Install by the po' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install by the po' (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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Replace with a 3.8 intake and noticed no performance differences
Performed · outcome unconfirmed
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Performed · outcome unconfirmed
I replaced with a 3.8 intake and noticed no performance differences.
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Suggestion
I did this immediately after replacing a MAF for reliability/longevity.
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Suggestion
The following isn't the most scientific and definitive source, but he does a the best job testing products of anyone I've seen on YouTube, and it's easy to see the difference in filters in his tests.
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Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
looking to swap my k& n cold air filter back to oem airbox . ok.do l need to swap out throttle body . ? or can l purchase an adapter air tube . as l. believe the one on the car right now k n is aprox 3 inches in diameter. and the oem tube looks smaller say 2 " inches 🤔 . ? autozone have an adapter tubing . will this be ok anyone dine this. b4 ? l would appreciate some help thanks guys. georgeous out.
I am about to do the same on my car.
The K&N is plug and play, it does not change the throttle body, I don't see why the OEM airbox would not plug on the OEM throttle body...
I purchased mine with a K&N installed by the PO. I decided to go back to stock and no, it doesn�t require any parts to do it. Just swap the units.
That said, I put the K&N back on after a week or two. I missed the sound and butt dyno performance. It really did �feel� better than stock to me. The sound was the biggest thing I missed, though.
If u think the tb has be replaced with a larger one the u should by some calipers and measure it to make sure. An approximate measurement does not help. If u can get an acurate measuremnt on the outside diameter im sure someone here can confirm if its factory.
I'm aware that many 996 owners slam the K&N air filter, either as a result of direct experience or due to the volume of negative anecdotal postings. When I bought my 199 996 back in 2013, it came with a brand new uninstalled K&N kit. Then I started reading all the negative reviews and was reluctant to install it. I ultimately did install the kit, and other than an initial CEL which I simply erased, have never had a bit of trouble with it. I like the way it looks and sounds, period. YMMV.
They simply don�t catch as much dirt as the pleated oem one does. Fine for a race car, not so much good for a rear engine car. Probably not much if at all performance increase. The oem filter is pretty big for how much ho the engine has.
Ive not researched the K&n topic much, but didn't the factory gt3 cup cars, come with a cone k&n type filter, mounted directly on the TB?
Why are K&n/ CAI's not RL approved?
K&N is only as good as the care it gets.. If you service them correctly they are great,,
get sloppy under or over oiling and they can leak dust or get oil in the intake on stuff that doesn't like it.
I buy 2 for a vehicle so I can correctly clean and oil ,, biggest thing is they need hours to dry after
cleaning and the oil needs to be put on in multiple light applications. I store the one waiting to go in in a
plastic bag. (done the same thing with motorcycle foam air filters for years.
Not perfect for every situation.. but for specific cars, with the right setup they rock.
I don't run one on the Porsche because its MAF is too easy to foul..
My MAP based LS swapped jeep is running one..
Thanks. You are correct, for street production GT3s. The "CUP" race cars all used a filter mounted directly to the TB, hence why I'm unclear as to why there's so much negativity towards their use? Is it a Metzger vs M96 thing?🤷♂️
In addition to heat, filters vary in how much resistance to air flow (pressure drop across the filter, lower is better) versus how much dirt they let through.
The following isn't the most scientific and definitive source, but he does a the best job testing products of anyone I've seen on YouTube, and it's easy to see the difference in filters in his tests. Yes, K&N may let alot of air through and sound great, but that's because they aren't filtering much at all. Also, generally it seems that if our cars don't really benefit alot from the extra air flow without a tune or other work, then a K&N gives a good sound, at the expense of dirt in your engine.
You Tube
Compare the graph at 7:10 (air pressure drop) to the ones at 13:42 and 14:00 (5 micron particles allowed through). The K&N don't actually do much filtering.
What isn't shown very well in those gt3 cup photos is the interior decklid. They surround the filter and feed the motor air from outside of the engine bay.
This will give you an idea of what I mean:
997 GT3 Cup Deck Lid - American International Racing
PO installed a K&N. I replaced with a 3.8 intake and noticed no performance differences. I did this immediately after replacing a MAF for reliability/longevity.
Touche. It does appear that the MAF is mounted between the filter and TB, in some of those pictures. Perhaps they use an adapter of some sort, or as you suggested, not use a maf at all? Regardless; this is all sort of a moot argument. Filters that don't filter, and pull hot air, unless properly ducted, are the answers that I was curious as why folks don't like them on our cars. I've personally never had an issue with using K&N, Spectre, or BMC style filters, on any of my cars. Perhaps the rear engine layout 996 is more sensitive to these, due to less cooler air flow, and more dirt kick up, from having an entire vehicle in front of said filter?
This is a source reference. Confirm exact model applicability in the original material.
