Genuine OEM Audi Complete Cylinder Head, part number 06E103065CX. This cylinder head is the upper part of the engine that encloses the combustion chambers and forms the top of the cylinders. It houses the valves, spark plugs (in gasoline engines), and often the camshafts. It is a critical component for engine operation, controlling the intake of air-fuel mixture and the expulsion of exhaust gases. Genuine OEM cylinder heads are manufactured to exact specifications, ensuring proper sealing, heat dissipation, and valve train geometry for reliable engine performance and longevity.