K&N Air Charger Air Intakes for select Harley-Davidson Touring, Soft ail, Twin-Cam and Sportster motorcycle models increase power by eliminating the restrictive stock OE air cleaner and replacing it with a K&N High-Flow Air Filter and mandrel bent aluminum intake tube. These intakes come with a billet aluminum throttle-body mounting plate and mounting hardware. K&N High-Flow Intake Systems give your Harley an aggressive appearance while providing a significant increase in airflow resulting in more power. These K&N air intakes are street legal in most states. They are not legal for use in California and other states adopting California emission standards.