I have one in the wing root with an alternate air door. It's also hooked up to a ram air scoop. It's all aluminum and is just aft of the rudder cable. It uses a Brakett BA-4305, I think. Not very big, but the foam filter is designed for a much larger engine. Easy to replace and no need to remove the wing or engine parts. Wish I could send a picture, but I can't. Andy Judge N55AJ FGE IO-360