Post by
Sentientbydesign »
https://forums.nicoclub.com/sentientbydesign-u25395.html
Fri Sep 04, 2009 9:39 am
Cotton Gauze filters initially (read = when perfectly clean) don't filter well, but flow really well. Once they get dirty, they filter better, but flow worse.
I personally don't like having the oil them and worrying about initial filtration, so I have AEM Dry Flows on my wife's car. My G came with the stupid K&N drop-in and I haven't decided if I want to invest $300 in an AEM intake.
The oil is tacky and makes the dirty/dust stick to it instead of just tumbling through the filter holes. The dry filters are synthetic and have much finer filtering from the get-go, but sometimes at the cost of flow.