Never liked the air filter directly connected to the engine taking in hot air inside the cowling. Against all my motorhead experience. When Kitfox introduced the 915is into its stable of engines, they came up with an external intake system to route outside air into the engine. Saw that and ordered one from Kitfox since the 912is uses the same intake system. Heather got it sent out and I now have it installed. Much better in my mind than the inside cowling air and it gives the air sensor for the Rotax injection a great place to be mounted (backside of the air box).