Reply With QuoteI vote for a sticky here.....Originally Posted by Jeff N.
Happy New Year.
Grand Master
Interesting Air filter review
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy
Big Time Poster
I vote for a sticky here.....
Happy New Year.
Big, Big Time Poster
In a nutshell, we don't need K&N.
(SOLD) 92 525ia M50 | NGK plug | JVC AR560 | EAT chip | California
Big, Big Time Poster
Is K&N really THAT bad? Those figures say yes and it seems unbiased so I guess so. Always though K&N was a decent brand though.. glad I stuck to regular
Big, Big Time Poster
Yes...they are that bad for a daily driver!!
K&N's may be fine for an application that requires minimum filtering/restriction but, especially in the case of BMW's, stock filters have been proven to be the best for OUR applications. A similar test was done on a couple of motorcycles with virtually the same results and there was also a study published (trying to find it!) showing stock vs K&N filters on a BMW Boxer motor and the stock filter was actually better all around.
I have only ever used BMW or OEM BMW filters in both the car and my bike.
"Uncle" Phil C
2011 Kia Optima EX-P.
Former owner of a 95 525i 5spd. "The GQ" aka A Shark in sheeps clothing
03 R1150RT 6spd. "DaRTth"
00 R1100R 5spd. "LeRoy"
5-10 Grand Master
I wonder how the newer AEM and ITG filters compare
Grand Master
more airflow = less filtration.
CAVEAT:
unless you are significantly increasing the size of the air filter without changing filter element construction... not really feasible in most cars.
Last edited by attack eagle; 01-02-2008 at 09:28 AM.
Major Contributor
I remember reading a not-so-scientific test done on air filters. K&N basically came in last. Apex'i came first in terms of filtering power. It's the one I am running right now, it uses dry technology so you never need to oil it.
FS: PBR Deluxe rear brake pads [new]
Big, Big Time Poster
1993 525iA M50TU
Black on Black...need pics
208,888 miles
Big, Big Time Poster
I know rodders who have been running engines over 200k using either no filter at all (just scoops) or a metal screen (at the bottom of the scoop) and the engines are not getting tired or anything. And they always have their foot in it. Now, as far as it making the oil dirty faster, okay, but if you don't give oil a chance to go bad, it won't. These guys change every 2k (me too), at the very least so it really doesn't seem to matter.
I see alot of tests that prove one filter filters better than the next, flows better than the next, etc. I haven't seen one that proves using one filter as opposed to another, or no filter for that matter, causes premature engine failure in comparison to actually using one. Unless you're a fool who let's the oil get completely contaminated and useless, I don't see what the problem is.
However, I do see how this could be a problem to an extent on many cars since it would probably cause, say, a MAF to get dirty faster. Other than that...? What say you?
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