This is from my Can Am Outlander 800 HO EFI ATV. The PO did a lot of good stuff to this machine to make it super tough, super reliable, and super fast. This wasn't one of the parts I appreciate. As you can see, the inside of the intake elbow is basically as dirty as the outside. Before the mitigating statements begin: [*]The filter was specifically engineered for this machine. It is listed as fitting nothing else. [*]The filter was oiled well enough that my fingers became oily just from gently handling it. [*]The filter was not caked, and had no holes or damage to it. [*]The filter was tightly mounted to the elbow, and the elbow was tightly mounted to the throttle body tube Fortunately, I ordered a Moose Racing oiled foam filter the moment I saw the K&N. Just installed it after washing out and drying the snorkel tubing and the upper and lower airbox halves. Ordered a Donaldson TopSpin cyclonic separator to go on top of the snorkel as well, to get out as much of the sugar sand from the air before it even gets into the intake tube. When riding behind another vehicle, it is invisible at 30 feet, thanks to the rooster tail of dust on the hardpack roads. This will come in handy. Ejects 80-85% of everything that goes into it. Soon as it comes in, it's going on top of the snorkel. Long story made short, K&N is NOT what you want when off-roading. Never seen anything behind a UNI, TwinAir, or Moose oiled-foam filter. This is a crime on small engines. I've seen engines requiring a valve job after 150 hours because of dirt entering the intake. This engine seems to have survived, but I'll not be letting this happen again.