[rashid]

Any experience with K&N oiled filters (the regular air filters) on an e39? Any difference comparing to the stock ones?

 

[darksigno]

chances r that the air filter already is a K&N, if it isnt u will get an increased amount of hp(most prolly not much bout 5-10) if u were to add a pod filter to it then go for something that works well like afe or injen or drift(if u want to go cheaper)

 

[bowtie]

I would pass on the K&N, here's a link for ya...filter test.