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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-28-2010, 08:21 PM   #101
sprintman
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Agree re headers. Equal length mandrel bent headers on mine, with German
Hiop RaceTec (HRT) sw with a PeakRPM CAI. Hiflow cats in a week or so.
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Old 12-28-2010, 08:26 PM   #102
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Im going catless. My factory headers dont have cats and i have a friend who does my inspections so no problem with that. If i get the intake ill prolly get the bmw perf intake i want to keep the stock look for resale. Thnx for the replys

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Old 12-28-2010, 08:41 PM   #103
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I did search "K&N" in that bobtheoilguy link, and discovered he said that K&N is the best performance filter for power, but paper filters better. K&N says that their filters filter 99% as well as stock. So if this is true, hence the trade off... more power, more stress, but isnt that true with any power adder? will your engine live as long with a supercharger or headers? will you become as big and strong without the steroids?









Good link, but K&N is still shown to be the best performance filter! K&N filters 99% as well as stock. its a trade off for the improved power; if you add a supercharger, or headers doesnt the increased power possibly decrease engine life. if you want to be big and strong dont you need to take steriods? that will shorten your life too right? Not getting rid of it and will always choose K&N in my future cars as well. any aftermarket filter other than paper with not filter as well, but we're talking miniscle 1% and K&N shown to be the best aftermarket filter available for performance.
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Last edited by BeMyWhip; 12-28-2010 at 08:42 PM.
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Old 12-28-2010, 08:56 PM   #104
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http://www.bobistheoilguy.com/airfilter/airtest2.htm

http://forums.evolutionm.net/evo-eng...t-results.html

http://www.afssociety.org/education/1208oneminute.html


Someone awhile back posted a big independent test of a dozen or so different air filters, including K&N. Needless to say, oiled cotton gauze filtered worst by a large margin. Can't seem to find the article now...
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Old 12-28-2010, 09:02 PM   #105
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http://www.bobistheoilguy.com/airfilter/airtest2.htm

http://forums.evolutionm.net/evo-eng...t-results.html

http://www.afssociety.org/education/1208oneminute.html


Someone awhile back posted a big independent test of a dozen or so different air filters, including K&N. Needless to say, oiled cotton gauze filtered worst by a large margin. Can't seem to find the article now...
None of these tests show engine blowing up because of k&n.
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Old 12-28-2010, 09:04 PM   #106
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He only sees what he wants to see, nothing unusual there. Anyway my filter outflows Krap & Nasty and actually filters. I personally imported it from the U.S, and it wasn't expensive.
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Old 12-29-2010, 09:38 AM   #107
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Originally Posted by MntnTwisties View Post
Im going catless. My factory headers dont have cats and i have a friend who does my inspections so no problem with that. If i get the intake ill prolly get the bmw perf intake i want to keep the stock look for resale. Thnx for the replys

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Just keep your stock box for when the time comes to sell, thats what I did (this way no one will know you had a K&N which destroys the engine on) and even though you put your engine through catastropic conditions no one will know hahahahahaha. NOT! But seriously, just store your stock box and use what ever you wish in the mean time, I even saved my stock exhaust manifolds if I sell it.
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Old 12-29-2010, 11:08 AM   #108
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Conforti ITG. Turner motorsports. Easy maintenance and sounds great. Lil pricey though

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Old 12-29-2010, 11:19 AM   #109
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Conforti ITG. Turner motorsports. Easy maintenance and sounds great. Lil pricey though

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I hope you checked up the UOA's on that first because there are people here who will attack your filter choice!
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Old 12-29-2010, 12:03 PM   #110
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Well I love mine and no issues for 5years

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Old 12-29-2010, 02:28 PM   #111
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Just another crappy foam filter that has to be oiled. Filter technology moved on from this many years ago but some people are stuck in the past.
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Old 12-29-2010, 04:32 PM   #112
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Good link, but K&N is still shown to be the best performance filter! K&N filters 99% as well as stock. its a trade off for the improved power; if you add a supercharger, or headers doesnt the increased power possibly decrease engine life. if you want to be big and strong dont you need to take steriods? that will shorten your life too right? Not getting rid of it and will always choose K&N in my future cars as well. any aftermarket filter other than paper with not filter as well, but we're talking miniscle 1% and K&N shown to be the best aftermarket filter available for performance.
Ya gotta love marketing. Even K&Ns website dances around the filtration issues by throwing vague figures about particle size and filtration "quality". They reference the older ISO 5011 standards from 1992 instead of the newer ISO 16889. And according to K&N's figures, that "miniscule" 1% less filtering efficiency falls right in the critical particulate size of 20-50 microns. Look at any SAE white paper and see what particle sizes cause the most wear on iron, aluminum, nickel, chromium, and soft bearing overlay material such as lead, tin and copper. You guessed it, 20-50 microns. So if you have a filter that can effectively keep those sized particles out, you lower the wear. Have a filter that is 99% of that, and allows the bypass of these larger particles? Well, it will increase the wear. Makes sense right? Also, that "miniscule" 1% reduction in filtering efficiency is inversely proportional to the "miniscule" 1% increase in "performance". While measurable, it does come with trade-offs. THIS is what needs to be considered, not whether the K&N lets in more dirt (it does).

Just like any mod you do, you weigh the pros and cons. I prefer to keep the dirt out (for one reason) so the K&N stays on the shelf, but thats just me.

Last edited by shortyb; 12-29-2010 at 04:34 PM.
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Old 12-29-2010, 05:45 PM   #113
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I used a K&N in my offroad Jeep CJ5, and the intake after the filter was always clean -- if there was ever a place for a K&N to fail, I went there with my Jeep.

I'd use a K&N in a heartbeat FOR ONE REASON ONLY, and that reason is to save on replacement costs. Since I used my Jeep offroad, the air filter was _always_ getting dirty, and I was spending a small fortune on air filters. I installed a MPFI kit -- I removed the carburator and intake, and replaced everything with fuel injection -- that came with a K&N.

On my street cars that need to have the air filter replaced once a year on the high mileage car, and once in several years on the low mileage one, I see no advantage in a K&N. Basically, it will take a half dozen paper filters before I have spent the cost of a K&N, and given time horizons like that, I just don't see the benefit.

If you are racing and will notice a performance gain through better breathing, or offroading and will see a cost reduction through cleaning instead of replacing, then a K&N starts to make sense. If you are just getting on the freeway day after day to slog your way to the office, get yourself a stash of paper filters and put one in every year or so as it gets dirty.
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Old 12-29-2010, 08:32 PM   #114
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BMWe46NYC you cant say I didnt warn you lol
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Old 06-20-2013, 12:30 PM   #115
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What about a Green Filter?

Anyone used or heard much about Green Filters? https://www.greenfilterusa.com/store/2405

They seem like high quality stuff._nr_
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Old 03-14-2014, 12:11 AM   #116
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Hey everyone, I just bought the one that OEM as a result, everybody has problems with K&N. Therefore, summary of my off-day that I have been researching users have been struggling with K&N when their sensor fkn up. So, my opinion having oem filter and changing rarely make better sense..
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Old 03-14-2014, 02:41 AM   #117
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very old thread. don't worry about K&N filters causing issues. long time over hyped myth.
with that said, BMC is none of the best filters for performance and filtration. Now if you live in a dust bowl maybe stick with stock paper filter. if performance and lifetime use, BMC is plenty fine.

Last edited by Alex323Ci; 03-14-2014 at 02:44 AM.
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Old 03-14-2014, 03:06 AM   #118
marek5
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I normally go for bosch


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Old 03-14-2014, 05:21 AM   #119
sprintman
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very old thread. don't worry about K&N filters causing issues. long time over hyped myth.
with that said, BMC is none of the best filters for performance and filtration. Now if you live in a dust bowl maybe stick with stock paper filter. if performance and lifetime use, BMC is plenty fine.
You obviously haven't read many UOA's from Krap & Nasty equipped engines.............
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