Add Style and performance to your Harley Davidson. These new Billet Air Cleaner kits offer both. Your engine can breathe freely through a reusable High Flow Air filter. This allows for Performance gains up to 20%, depending on your engine configuration. (Compared against the stock air cleaner setup) The filter is covered by a contrast cut, billet cover. Each cover is milled out of a solid block of aircraft grade aluminum. This set comes with the required mounting bracket, breather bolts, hoses and gaskets.