Hotshot crews have been putting the MaxFlow filter on their professional Stihl chainsaws for more than 15 years. The 044 and MS460 are excellent saws and MaxFlow air filter system makes them even better in a firefighting application. The oiled foam air filter traps more of the type of burnt dirt and ashes that is so tough on a saw, and it flows more than twice the air of a stock filter, so it runs longer between cleanings. See more at http://www.equiteemfg.com/air-filters-1/