This Belly Pan streamlines the undercarriage providing smoother air flow and less wind drag and buffeting at highway speeds. It also protects softer undercarriage parts like your coolant tank. A custom engineered perforation pattern is incorporated to increase ventilation for better airflow. Made from aircraft quality aluminium and designed in 2 pieces for easier oil filter access. Edges are softened to minimize sharp edges. Made in the USA. Fit's all Honda GL1800 2001-2017