A magnetic snap-in velocity stack; oversized filter; and a billet backing plate with a concealed integrated breather system combine to deliver reliable; high-volume airflow. Dyno testing continues to show roughly 8 horsepower gains over stock intakes; proving its efficiency across the entire M8 lineup.For riders building the newest models; this intake offers a clean fit; strong flow numbers; and the performance advantage the Assault line is known for.Rain sock included in the box. Please check packaging thoroughly. // Fitment: 17-23 Touring; 18-24 Softail