Breather design is o-ringed at the heads, passes through the backing plate and exits inside the mouth of the throttle body through proprietary shooter tubes. Air cleaner cover is forged and CNC - machined into a angled shape for excellent leg room. Integrated polycarbonate top is coated for long-term durability. Performance air filter is made from black synthetic material wrapped in stainless steel mesh. Filters are washable and water-resistant.