A billet air cleaner is a custom automotive part that is cast from metal, usually aluminum. The shape and design can increase airflow and overall engine performance or just enhance the motor's appearance.
A billet air cleaner is part of engine dressup for any custom project. It generally comes polished. Installing an air cleaner is easy and can be accomplished in a couple of hours. Billets are pieces of metal created directly via continuous casting or extrusion, giving them great strength and a uniform look. Some billet air cleaners are designed to lower the overall profile of the air intake system.