Hello everyone, yesterday I removed the Pipercross filter from my FK8 after approx.14tkm for cleaning and was scared: I could recognize dust particles on the “clean” side. Also, the lower sealing surface to the airbox was visible coarse dirt. It seems to me that the sealing lip cannot properly seal. I measured with a measuring slider, the thick seal looks really good. I attached pictures to you and wanted to ask you about your experiences with the filter. Although it sounds really good but I don’t want to hurt my engine. Now the original filter is in it again. I contacted Pipercross once, let’s see what the guys from England say. LG Edit: You can’t recognize it, because the back side of the picture was already clean. But the sealing surface was covered with coarse dirt on the filter and on the airbox.