The Genuine Audi Exhaust Manifold Washer - 06A145791A is a component used in the exhaust system of Audi vehicles. It is a small, circular metal washer that is designed to fit between the exhaust manifold and the engine block. This washer helps to create a tight seal between these two components, preventing any exhaust gases from leaking out. It is an authentic Audi part, specifically designed for use in Audi vehicles.