Genuine OEM Audi exhaust flange gasket, part number 4F0253115F. This gasket is designed to create a high-temperature, gas-tight seal between exhaust pipe sections, preventing exhaust leaks before the catalytic converter. It is located at the exhaust system flange connection as highlighted in the diagram. Constructed from heat-resistant materials, this gasket is engineered to withstand extreme thermal cycling and vibration. Genuine OEM exhaust gaskets are essential for maintaining correct backpressure and ensuring that all exhaust gases are routed through the emissions control system as intended by the manufacturer.