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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > KN air filter vs OEM



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      11-30-2014, 03:31 PM   #1
pinco000
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KN air filter vs OEM

Hi guys, can you share some knowledge/experience with KN filters v OEM? All of my friends are telling me to go for KN, but none of them owns a BMW
Thanks
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      11-30-2014, 03:54 PM   #2
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OEM all the way.

I've seen 0 improvement with K&N.

I'm sure it's a cleverly marketed piece of equipment which relies heavily on the placebo effect.
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      11-30-2014, 04:23 PM   #3
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Had a K&N panel filter on my old 207 GTI. Couldn't tell any difference whatsoever compared with stock, other than it was a pain to clean.
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      11-30-2014, 04:47 PM   #4
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I have used a k&n and a pipercross. Before I fitted it tthe air flow meter was clean as a whistle! But after about 6-8k it had dust on the inside of the air flow meter which should have Been filtered out!

From then on I use oem never going to try and panel filter ever again!
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      12-06-2014, 03:19 PM   #5
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stick to OEM. Modern inlet systems are very good. IMO you will gain nothing with a K&N these days - I used to be fully sold on them 30 old years ago but not now.
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      12-07-2014, 05:45 AM   #6
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Odd then, that BMW supply a K&N as an approved accessory for fitting with the BMW Performance air intake...

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      12-07-2014, 12:42 PM   #7
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Quote:
Originally Posted by Phil325i View Post
Odd then, that BMW supply a K&N as an approved accessory for fitting with the BMW Performance air intake...

Attachment 1127048

How much extra bhp are BMW quoting for this accessory ?
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      12-07-2014, 01:07 PM   #8
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I'm not a fan of K&N so I fitted my car with an AFE dry element air filter. The primary issue with the K&N has to do with the variation in how much oil is applied when cleaning the air filter. If too little oil is applied it becomes substandard from a filtering standpoint, if too much oil is applied, you risk damaging the mass airflow sensor. So it becomes a question of, is a potential two to three horsepower gain worth the risk associated with using a K&N air filter?

By the way, my Dinan ram-air intake came with a K&N air filter and it's sitting unused in the box!
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      12-07-2014, 03:56 PM   #9
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I got the oem fitted guys, thanks
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      12-09-2014, 02:37 AM   #10
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This can be debated all day long and probably comes down to individual preference and opinion. I found that the filter alone did not do much but when it was coupled with the Rev Motoring pipe it was like having a performance induction system. On the rolling road in Surrey we noted a slight gain (cannot find graph). Think it was 4-10hp... but it could be felt slightly. Without the hose fitted the gain was minimal, 1-2hp. Personally, I think the filter works a bit better after 500 miles or so. I have always used K&N over the last 10 years and never really had any problems. Apart from on my turbo charged Micra in 2001 as I did not use mesh in the grille a random stone hit the 57i kit filter some how and made a hole through the cotton! In a box though I doubt that would happen.
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