From: Ed Hackett  
Subject: Re: Old Stuff (Air Filters)
X-Original-To: bmw@rider.cactus.org
Date: 25 Feb 94 00:12:40 CST (Fri)

Here's the info I have on air filter performance. Tests were done using 
SAE J726C Test Method  5-best --> 1-worst

                              Oiled foam    Paper   Oil Bath   Oiled
Gauze
                             (AMSOIL, UNI)                        (K&N)

Large particle efficiency          5          5         5            4
Small particle efficiency          5          4         1            2
Airflow capacity                   5          2         3            5
Dust holding capacity              4          2         5            2
Load up characteristic             4          1         5            1
Backfire characteristic            3          2         5            3
Cleanability                       4          1         4            3

As you can see, K&Ns are great for airflow, which is what they were 
designed for. Their original application was on racing engines, where 
airflow is important and ultimate engine life was of little concern.
They 
are not as good at filtering as paper or oiled foam types.


Also, checkout:

http://www.saabnet.com/tsn/archive/files/35/3550.html
For some more info.
- -- 
Justin Lassy
(V)Maximum Performance Motorcycle
mailto:Vmaxtuner@earthlink.net
VMOA#:  052
1985, 1994 Vmax