# Best Air filter micron vs flow (for BMW)

**URL:** <https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525>\
**Category:** NYSpeed Automotive\
**Created:** [May 15, 2008, 7:04pm UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525 "2008-05-15T19:04:57Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![E.Roy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/e.roy/32/5073_2.png) [@E.Roy](https://forums.speedlife.net/u/E.Roy)\
**Post date:** [May 15, 2008, 7:04pm UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/1 "2008-05-15T19:04:57Z")

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I was wondering if BMW’s have any problems with using K & N filters with the oil causing MAF sensor problems.

I hear Aem dryflow’s are decent. Also, I want a filter that filters _ **very well** _ while flowing well. I have a 2003 330i

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**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\
**Post date:** [May 16, 2008, 5:34am UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/2 "2008-05-16T05:34:33Z")

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you do understand that in order to flow very well = letting dirt into the motor…

the reason people have oil problems with the K&N is because people stuck at following directions when they clean and re-oil them. too much oil is often used and not enough drying time before reinstalling will cause problems.

foam styles ones are no better, they tend to break down and then the foam gets sucked in…

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**Author:** ![66impalass](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/66impalass/32/7429_2.png) [@66impalass](https://forums.speedlife.net/u/66impalass)\
**Post date:** [May 16, 2008, 5:37am UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/3 "2008-05-16T05:37:36Z")

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gruppeM

/thread

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**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\
**Post date:** [May 16, 2008, 5:56am UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/4 "2008-05-16T05:56:30Z")

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the gruppeM is a sex bit of kit.

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**Author:** ![Shockwave179](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/shockwave179/32/7496_2.png) [@Shockwave179](https://forums.speedlife.net/u/Shockwave179)\
**Post date:** [May 16, 2008, 9:40am UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/5 "2008-05-16T09:40:45Z")

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Get an ITG.

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**Author:** ![E.Roy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/e.roy/32/5073_2.png) [@E.Roy](https://forums.speedlife.net/u/E.Roy)\
**Post date:** [August 22, 2008, 10:46am UTC](https://forums.speedlife.net/t/best-air-filter-micron-vs-flow-for-bmw/48525/6 "2008-08-22T10:46:17Z")

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I went with an AEM cone filter, I will try to get a pic up