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Here are some pictures of the saws with 3-5 tanks of fuel thought them. All are holding the same max rpm as when the filter was clean. So no rich condition yet. I could run them for another day or two no problem. The first is a 440 BB. The second is a 046. I put the 441 just for reference. I...

The reason I started using them, is I can get thought the whole day without changing or cleaning a filter. On the Stihl filters I had to change the felt half way thought the day. With the max I can run for two days. B, I will pull mine off and see how much has made it thought.

It does re-lie on the person to know how to maintain a foam filter.

I use them. I am not sure on the extra air flow when clean. But they will flow more air when dirty, like at the end of the day. If you use a good filter oil on them like Bel-Ray, they do not seam to let any more dirt past than factory. But I have never run one in real dusty conditions, like a...