Go Radek, GO!! Keep an eye on this or do some hard riding with it asap. I've had two of these on bikes come in the shop. Both were eating dirt from the bottom side. Over tightened, as it's just a feel thing and no rim to keep the filter from moving out of round. Both had the main filter removed, or torn apart. so engine was eating dust and dirt and they didn't even know. If you like to run a CPR foam filter setup on the 990 ADV, let me know, I have a TEST unit here I could send you. Last ones we tested worked great in the Mexican 1000. Little to no maintenance. It has so much more surface area than the "Snorkel" setups. Email me if I can be of help. Good luck and Ride Safe.