Akrapovič Slip-on Line 4-stroke FE, FX (250, 350, 390, 450, 501, 570) 09-16This slip on factory silencer has been developed in collaboration with Akrapovi for the very specific requirements of enduring offroad use (for enduro, motocross and supermoto too) and very carefully tuned to the Husqvarna characteristics. The benefits: Improved torque curve combined with very rideable peak performance More sensitive throttle response and resulting improved traction Durability suitable for extreme enduro use Made from titanium that