BIO Dual Stage Twin air filter designed to fit the Yamaha Raptor 660 quad - factory PRE-OILED.

Twin Air is the world leader in Dual Stage foam air filters. The filters provide the best combination of air flow and protection for your ATV engine. Just ask riders like Chris Borich, Dustin Wimmer, Adam McGill, and Cliff Beasley. These riders trust our filters to get them to the finish line.

Every Twin Air filter is constructed from two layers of open-pore foam that are bonded together to provide maximum filtration and superior airflow. A coarse-foam outer shell is flame laminated with a fine-foam inner core, resulting in a one-piece design that is both functional and durable.

This original Twin Air filter is pre-oiled according to Twin Air factory standards. Each filter is completely submerged in Twin Air Bio liquid power filter oil. Massaged to ensure all pores are evenly coated with oil, then placed in a temperature controlled room to allow oil to completely cure.