Adding more cfm of airflow through your carburetor is as easy as replacing your existing air cleaner with one of these Xtra Flow air cleaner assemblies. These air filters allow air to enter smoothly from the top, which helps draw more air in from the sides. That means you get more airflow headed down the carburetor or throttle body and into the combustion chamber for greater performance and efficiency. So, if you are a serious racer, or just need more airflow, then you need to get one of these. Cleanable and reusable!