Jim,
This is true for K&N OIL filters. (I have seen published data).
Make sure the source of this information is comparing AIR filters
before you jump to judgment.
Kev
On Jan 10, 2009, at 5:54 PM, Jim Johnson wrote:
> I just read the following from another list I am on...
>
> **
> The only filter testing I'm aware of done to ISO standards compared
> filters for a GM Duramax Diesel. An interesting result from those
> tests:
>
> Compared to the [stock filter], the K&N "plugged up" nearly 3
> times faster, passed 18 times more dirt and captured 37% less
> dirt. See the data tables for a complete summary of these
> comparisons
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