This exhaust manifold gasket seals the joint between the manifold and the cylinder head, preventing exhaust gas leakage. It sits at the interface where hot exhaust gases exit the engine block and enter the manifold. A failed gasket produces an audible ticking or hissing sound during engine operation and can cause a drop in engine power. This component is manufactured to the original geometry and material specification, which maintains the correct clamping force across the sealing surface. On reinstallation, clean both mating surfaces thoroughly and tighten the fasteners in the sequence specified by the engine manufacturer.