As I was looking under the hood of my '04 2.5 naturally asperated Outback I noticed an interesting feature. On the underside of the hood there is an air dam that, when the hood is closed, appears to block a significant portion of the intake. It is only a cheap plastic piece. My question is what is this for?? My only guess would be to keep water and debris from entering the air box? I'm a currently removing it on mine and my families to test determine a link to fuel efficiency, but I was wondering if any one else knew of these??
Brian