Areyourshop 4x 48mm Cold Air Filter Pod Style for CB250 CB400 CBX550 Bike ATV Scooter Size: Inside Diameter : 48 mm Overall Height: 3 1/4 inch Outside Diameter at Widest Point: 3 inch Outside Diameter at Top: 2 inch OEM Peplacement Part Number:12-55748 It is made to be clamped directly to the back of your carb.Cone style. By installing a filter on each carb you reduce restriction from the air box. Allow each cylinder to breathe on its own. Increase airflow & adds up 2 to 10 horsepower. Washable air filter that will fit a variety of carbureted motorcycles. Accordion mesh design improves filtration process. Improve throttle response,add more horsepower. Come with adjustable clamp for a perfect fit. This is a nice, washable and re-usable filter. Environmental Protection and Safety. Easy to install,no Installation Instructions.