This is not your typical air cleaner. With its clear plexiglas cover, and hidden integrated breather system, this Hi-flow air cleaner was designed to give a clean, simple, & aggressive look, made to stand out in a crowd. Introducing a new Nick Trask innovation, every Assault Charge Hi-flow air cleaner comes with the new Trask snap in velocity stack. This simple interchangeable snap in velocity stack can be changed quickly and easily to accommodate different sized throttle bodies. Clean and easy to maintain with a rechargeable filter element as well as dyno tested in house producing 8-10 horsepower gains over the stock OEM air cleaner.