So the Cosworth's should perform as well but let less debris through?

You'd need to directly compare flow data, I don't have flow numbers for either.

Interesting....

So for engine longevity, would people say its better to just stick to more restrictive (no power gains)

the K&N's dont either

Pretty sure K&N doesn't make a dry filter?

I thought they are oil based

If you ran a K&N filter without oil it'd let everything in just about. :icon17:

edit: m4a1 beat me to it. ^^

if i'm not mistaken, K&N's are oiled out of the box. they may not "require" oiling, however, that's how the filter traps dirt and dust. no oil on the K&N = no filtration, from my understanding.

you wash them and reoil every 30-50k miles depending on where you live/driving habits etc.

Exactly. After it gets dirtied the filter must be cleaned, dried, and re-oiled.

Yes yes thats what i meant... sorry for the confusion.:tup:

i have the AFE dry flow-s filters...im pretty sure is what they are called.

i dunno how great or terrible they are,but i like them

Cosworth is disposale (you have to buy new one's at regular service intervals).

I think K&N flows more than 10% over OEM.

The K&N and Cosworth both claim around 98% (K&N states 96-99% is what their filters normally test, obviously variance exists).

K&N Air Filter Efficiency Testing

Where did you get this? Is this a table created from the diesel-forums test a while back?

i read somewhere that Cosworth said you can vacuum the filter and it'll be good-to-go.