FTP F2X F3X B48/B58 HIGH FLOW AIR FILTERFTP air filters are made with a durable rubber, with optimum adhesion characteristics to ensure fitment to all shapes of boxes. These air filters are also created without welded joints. creating a one piece air filter, increasing durability. Replace your OE air filter with high flow Air Filter for F2X F3X B48 B58 engine Benefits Better Gas Mileage Reduced emissions Inexpensive and quick upgrade Extends engine life Increased power Increased Airflow