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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Anyone know the K&N Air Filter part number replacement for the e90



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      10-23-2005, 08:51 PM   #1
tiga901
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Anyone know the K&N Air Filter part number replacement for the e90

Thanks in advance for the help!
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      10-23-2005, 09:10 PM   #2
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the information i gather from other forum mbrs is that E90 engine is too new and its not available yet. the site, last i saw, did not have the option for 2006. My voice mail messages wasnt return also.

good luck, inform us is get any further than us!
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      10-23-2005, 11:07 PM   #3
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Thanks...will do.
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      10-24-2005, 03:49 PM   #4
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I too looked for this info about a month ago (and couldn't find a specific filter for the E90), but after reading reviews on the K&N filters, I think I'll stay away from them for now. From what I could ascertain, the way it increases the airflow into the system is by allowing more air to pass through the filter and thus much more potentially damaging dirt/pollutants into the engine. There was a study done that compared many different brands of air filters, didn't give me any confidence at all!!
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      10-24-2005, 04:16 PM   #5
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Quote:
Originally Posted by tiga901
Anyone know the K&N Air Filter part number replacement for the e90
Why? Why do you want mess up an ultimate driving machine with a piece of junk. If you want to increase the air flow, you can achieve the same thing by using your significant other's used panty hose wrap around the air intake. Don't fall for the KN Advertisement hype. If the auto manufactures think this will work, they already jump in there with two feet.
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      10-24-2005, 04:34 PM   #6
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I had a K&N replacement filter fitted to my E46 320d and it ran without any problems at all.

I fitted it when the car had reached 19000 miles (first oil service). I was astounded at how dirty the OEM filter was and my dealer said that it wouldn't be replaced until 60000 miles! The engine would be starved of air by then. My neighbour has an E46 330i Clubsport and has found the same amount of dirt at 15000 miles.

I don't know if it was the K&N filter or just the fact that I replaced the dirty filter, but performance did improve and my fuel consumption improved by about 10% as a result . From our experience, if you want to maintain max airflow, replace your filter more regularly than the service schedule recommends i.e. at the first oil service.
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      10-25-2005, 10:43 AM   #7
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Im happy to hear this, i cant wait to get those filters for mine. It was suggested to me by a 645ci owner, having said that Im sure he knows what he is talking about just like you.

Last edited by ase2dais; 10-25-2005 at 11:37 AM.
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      10-25-2005, 10:47 AM   #8
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Quote:
Originally Posted by lwongveros
There was a study done that compared many different brands of air filters, didn't give me any confidence at all!!
Can you point me to that link/reference/article about the study?
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      10-25-2005, 11:22 AM   #9
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I advise against the oil wetted air filters (like K & N) for street cars. They provide less effective filtration and the oil can coat and render ineffective the MAF which is an expensive part. Such filters increase the noise level somewhat and many mistake the increased noise with increased power.
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      10-25-2005, 11:39 AM   #10
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Quote:
Originally Posted by ben1364
I advise against the oil wetted air filters (like K & N) for street cars. They provide less effective filtration and the oil can coat and render ineffective the MAF which is an expensive part. Such filters increase the noise level somewhat and many mistake the increased noise with increased power.
I dont thnk I will ever go that route, just the sound of "oil wetted" starts to scare the living sh*t out of me. thks though!
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      10-25-2005, 12:00 PM   #11
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Quote:
Originally Posted by ase2dais
It was suggested to me by a 645ci owner, having said that Im sure he knows what he is talking about just like you.
This has to be my all time favorite quote.
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      10-25-2005, 12:35 PM   #12
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My 325i when she grows up wants to be a 645ci, lolz
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      10-26-2005, 01:46 AM   #13
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Quote:
Originally Posted by ase2dais
I dont thnk I will ever go that route, just the sound of "oil wetted" starts to scare the living sh*t out of me. thks though!
I ran with the K&N filter fitted for 25000 miles without any MAF problems and I know of others also without any problems. Advice I was given from contacts in the motor sport business suggested that oil wetted filters can be a problem if after cleaning the filter at a later stage the owner over oils the element. Providing you don't over oil it you shouldn't have any problems.

Regarding the noise - I've fitted K&N filters to all my BMWs (320 diesels, 320i and 330i) and have not detected any increase in noise. The replacement filters remain enclosed in the OEM filter /airbox housing! If you fit an induction kit then yes, the noise is increased significantly (not a good idea in my opinion). It spoils the character of the car!
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      10-26-2005, 04:15 AM   #14
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The MAF problem seems do depend on the design

I personally know 5 E39 540i and M5's ( they use the same model MAF) that had to have their MAF replaced because the engines started running at half power due to contamination from K&N Filters after a few thousand miles. You can read up on the problem on www.m5board.com where there are hundreds of such cases. You have to replace it, cleaning doesnt work and a new one costs $$$$$$.


But then on the E46 you never hear of such problems, so its related to the MAF design


Now who is going to go and test the E90's MAF to see if it likes K&N type filters or not ???
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      10-27-2005, 09:24 AM   #15
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E90 Fleet wrote in part, "Now who is going to go and test the E90's MAF to see if it likes K&N type filters or not ???"
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I will not do so. I see no advantage in replacing the treated, pleated paper filter with 1940s technology on a street engine. When I first started noticing the return of oil wetted filters, the pitch from the marketers was, as I recall, that they would save money since they could be cleaned and re-oiled. More recently, the pitch is that they pass more air.
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      10-27-2005, 05:13 PM   #16
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You could be right about it affecting certain applications.

Today I managed to speak to a guy who works for the same company as me who I know fitted a replacement K&N filter to his 530i which he bought new 6 months ago. He says he's not had any problems so far but also hasn't noticed any benefits either!

I presume the MAF fitted to his car will be the same as that fitted to my E46 330i which ran without problems.

Clearly it pays to err on the side of caution here. Staying with OEM parts is often the safest thing to do. However MAF failures have been fairly common here in the UK with the standard OEM filter fitted particularly on diesels so I'm not sure what's going on!
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      10-27-2005, 05:54 PM   #17
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I just hope to fit an Euro Air intake to my US 325i. Regardless in performance, the design has better taste.
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      10-30-2005, 07:25 AM   #18
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webcoll wrote in part, "...Clearly it pays to err on the side of caution here. Staying with OEM parts is often the safest thing to do. However MAF failures have been fairly common here in the UK with the standard OEM filter fitted particularly on diesels so I'm not sure what's going on."
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While I can see possible benefits from less restricted air flow on a race engine that is tuned for it, I see no advantage on a street engine. I agree with webcoll that oem parts or similar are usually safer than experimenting.
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      11-15-2005, 04:56 PM   #19
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I just got an e-mail directly from K&N which said they now have a drop in replacement air filter for our cars. Check out this link. http://www.knfilterchargers.com/sear...x?Prod=33-2332
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      11-15-2005, 11:25 PM   #20
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Thanks!
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      11-21-2005, 04:57 PM   #21
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Does anyone know where to get the new K&N Air Filter (33-2332)? From what I can tell, it is too new and know one has them yet.
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      11-21-2005, 06:53 PM   #22
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www.summitracing.com

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