K & N air filter for X5

[rogerkiu]

Hi all, I just bought a K & N air filter (http://www.knfilters.com/search/prod...x?Prod=33-2149) to replace the oem filter for my X5 4.4i. Anyone here has this experience of this? How is the result? Please share. Thanks!

[Tomaz]

There are threads implicating the K&N filiers for causing problems with the mass air flow sensor by oil coating it. I would use the OEM paper filter and throw it away when it is dirty.

[alpac]

I have been using a K&N filter for 2 1/2 years now. Did not have any problem with it but I did not notice any difference with the OEM one in performance nor fuel consumption after I installed it.

[Tom G.]

Originally Posted by Tomaz

There are threads implicating the K&N filiers for causing problems with the mass air flow sensor by oil coating it. I would use the OEM paper filter and throw it away when it is dirty.

Agreed, or the aFe filter:



aFe - High Performance OE replacement air filter for most BMWs
http://www.europeanautosource.com/pr...oducts_id=1115

The aFe filters use a vegetable-based oil that will not leave a film or harm the HFM. Filters are lifetime warranty and reusable.

[///Manuel]

In terms of performance I think it would be noticeable in the high revs only. Our cars are so heavy that it's hard to notice any pick-up/throttle response. I remember taking over 100 lbs off the car (120-140) and noticed no difference!
Maybe with a throttle body upgrade, exhaust and software one can see an improvement?
The CAI sound in the X5 is very sweet though, it's nothing like in my E36 3.2L engine.

[Wagner]

had it in mine, useless.

[drew]

Originally Posted by Tomaz

There are threads implicating the K&N filiers for causing problems with the mass air flow sensor by oil coating it. I would use the OEM paper filter and throw it away when it is dirty.

i had the same issue on my X5 with a k&n.

[klnteg]

I think to be honest, the K&N will not do anything performance wise for you! that you will notice anyway. If you want performance do a complete intake with throttle body upgrade. you should notice something then.

[///Manuel]

Oh I thought we were talking about CAI... my bad.

[rogerkiu]

Thanks a lot for all of your opinions! I wish I would have raised this inquiry before I bought it. Now I decide not to use the K&N thing and go stick with OEM. Thanks again.