K & N air filter for X5
 

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!

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 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.

Agreed, or the aFe filter:

http://www.europeanautosource.com/im...0-10015ais.jpg

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.

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.

had it in mine, useless.

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

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.

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

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.