Big Sucker™ Stage 1 performance intake for M-Eight FLT touring models adds new features to the original industry-leading air cleaner and designed to accept factory air cleaner cover. New hidden breather backing plate technology is a step up from original system. Each breather is O-ringed at the heads, passes through the backing plate and exits inside the mouth of the throttle body through proprietary breather tubes. To ensure no oil saturates the filter and restricts your airflow, we also integrated a new oil reservoir that can be serviced when you service the filter element.