Mercury - Replacement Air Filter EFI FourStroke Series Composite Filter Media 8M0082911. Overview. There's something reassuring about hearing your outboard breathe cleanly and evenly when you turn the key. That soft intake sound - steady, smooth, almost familiar - tells you the engine is getting exactly what it needs. With the Mercury 8M0082911 Air Filter, you'll feel that same comfort every time you leave the dock. It's a small part, sure, but it plays a big role in keeping your boat ready for