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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > K&N Replacement Filter
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      03-07-2013, 08:38 PM   #1
mikew2069
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K&N Replacement Filter

Anyone put one in yet?
http://www.knfilters.com/search/prod...x?prod=33-2997
http://www.knfilters.com/news/news.aspx?id=4341
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      03-08-2013, 02:34 PM   #2
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I have one in now, seems smoother. Kinda like it felt with my old LCI n54 E90.

http://www.amazon.com/33-2997-Replac...=K%26N+33-2997
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      03-08-2013, 05:01 PM   #3
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Quote:
Originally Posted by ThreeThirtyFiveI View Post
I have one in now, seems smoother. Kinda like it felt with my old LCI n54 E90.

http://www.amazon.com/33-2997-Replac...=K%26N+33-2997
is it pre-oiled? how much is the cleaning kit?
I didn't want to risk oiling up the MAF...but I didn't even know if we had one.
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      03-08-2013, 05:09 PM   #4
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and most importantly, how does BMW react to it from a warranty perspective?....I just figure since they cover the air filters under basic maintenance, not worth the $37?
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      03-08-2013, 05:40 PM   #5
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some have tested f30 n55's on a dyno with no filter (full air blast!) and the car made no extra power. n55 electronics doing its thing
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      03-08-2013, 05:53 PM   #6
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Quote:
Originally Posted by TreDirtyFive View Post
some have tested f30 n55's on a dyno with no filter (full air blast!) and the car made no extra power. n55 electronics doing its thing
so skip?
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      03-08-2013, 06:39 PM   #7
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personally, I would.
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      03-09-2013, 07:14 AM   #8
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Quote:
Originally Posted by TreDirtyFive View Post
some have tested f30 n55's on a dyno with no filter (full air blast!) and the car made no extra power. n55 electronics doing its thing
REALLY?... that's very interesting. Defys all conventional thinking
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      03-09-2013, 12:15 PM   #9
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To me it just doesn't make sense from a cost perspective...I had filters on previous cars because I would wash and clean after each oil change I did.
Gone are the days i had time to wash, wax, oil change and filter clean my car...
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      03-09-2013, 01:10 PM   #10
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K&N has been around a long time, and AFE is a relative newcomer to the oiled-cotton "lifetime" filter element, although AFE also has some dry filters that are said to be more efficient. Interestingly enough, the Dinan CF intake for the E9X series included a K&N element for the stock airbox (their CF top with the extra snorkel replaces the stock top) and also a small cylindrical filter (6" long x 3" diameter) that fits on the end of the snorkel ahead of the fender liner. They flow pretty good, but I kind of wonder if there'd be any "gain" other than not having to replace the stock one at every scheduled oil service. Guess it depends on how dusty/dirty your driving environment is.
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      03-09-2013, 10:31 PM   #11
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Never was a fan of K&Ns....definitely coated my MAF sensors on other cars w/ oil.
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      03-12-2013, 06:09 AM   #12
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Quote:
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Never was a fan of K&Ns....definitely coated my MAF sensors on other cars w/ oil.
This. With all the sensors etc., I would be scared of a warranty issue. Go with AFE dry filter if you are really interested in trying something new. Personally, I am leaving well enough alone for now.
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