; 1; exhaust manifold introduction; exhaust manifold function; exhaust manifold is part of the automotive exhaust system (Figure 1). A turbocharged internal combustion engine with a turbocharger between the exhaust manifold and the front tube; also an internal combustion engine that makes the turbocharger and exhaust manifold a assembly. Each branch pipe of the exhaust manifold is respectively connected with an exhaust crossing of the cylinder head of the internal combustion engine, and the total exhaust port (1 or 2) is connected with a supercharger