Jason Poh,
Kuching, Sarawak Malaysia
I've since driven through dusty roads and city driving for about 5k KM on the filter. Took it out and checked and to my surprise, it seals perfectly well compared to stock factory air filters. Stock factory air filters do leak a bit on the sides and lets a bit of dirt into the inlet but K&N does not. The clean side is totally spotless and so is the inlet pipe. It may look much more porous, but due to its design, it works better. I am going to report back much later on my experiences.
Happy user.
Jason.